Table of contents of Chinese Journal of Polymer Science Jing Li (a, b), Fei-peng Wu (a), Er-jian Wang (a) /qikan/cpaper/zhaiyao.asp?bsid=7569 A series of hydrophobically associating polyacrylamides modified by small amounts (< 3 mol%) of a self-associative cationic monomer 4-(2-(acryloyloxy) ethoxy) benzyl tri-ethyl ammonium bromide (AEBA) as hydrophobe were synthesized by radical copolymerization in aqueous solutions without external surfactants. The resulting copolymers containing a multiblock structure exhibited a high tendency for hydrophobic association and a high thickening capacity. Solution properties and aggregation structures were investigated by viscometry and fluorescence technique. The high viscosity enhancement was found as the polymer concentration beyond a critical value c* and strongly depended on the copolymer microstructures. The number and length of hydrophobic microblocks within the copolymer backbones could be controlled by changing the AEBA concentration in copolymerization system. Addition of salt induced more hydrophobic association and viscosity enhancement. The synthesis method used was simple and environmentally friendly without any external surfactant contamination in comparison with the conventional micellar copolymerization. Sun, 20 Mar 2010 17:03:21 GMT Papers Hossein Mighani (a, b), Mousa Ghaemy (b) /qikan/cpaper/zhaiyao.asp?bsid=7570 Aromatic/aliphatic polyamides were synthesized from a diamine monomer, 2,3-bis-p-aminophenylquinoxaline (IV), based on quinoxaline and various dicarboxylic acids of aliphatic, aromatic and heterocyclic. The diamine and polyamides were characterized by elemental analysis, FTIR and 1H-NMR. The solubility of the polyamides was affected by the quinoxaline and heterocyclic groups in the polymer chain. They were all soluble in common organic solvents such as dimethylsulfoxide (DMSO), N,N-dimethylformamide (DMF) and N-methylpyrolidone (NMP). The polyamides showed inherent viscosity in the range of 0.25-0.3 dL/g in DMSO at 25∼C and good thermal stability with the char yields in the range of 65%-82% at 600∼C in nitrogen. Sun, 20 Mar 2010 17:03:21 GMT Papers Gui-lian Li (a, b, c), Chang-you Ren( a, c), Wei-min Dong (a), Lian-sheng Jiang a, Xue-quan Zhang (a), Fo-song Wang a /qikan/cpaper/zhaiyao.asp?bsid=7571 ﹞Neodymium chloride isopropanol complex (NdCl(3)﹞3(i)PrOH) activated by modified methylaluminoxane (MMAO) was examined in isoprene polymerization in hexane, with regards to Nd compounds, aluminum (Al) compounds, [Al]/[Nd] ratio, polymerization temperature and time. NdCl(3)﹞3(i)PrOH exhibited high activity producing polymers featuring high cis-1,4 stereospecificity (> 96%), very high molecular weight (M(n )> 1.0℅10(6)) and fairly narrow molecular weight distribution (MWD, M(w)/M(n) < 2.0) simultaneously. In comparison, neodymium isopropoxide also showed high activity providing polymers with narrow MWD (M(w)/M(n )= 2.07), but somewhat low cis-1,4 content (ca. 92%), while neodymium chloride had no activity under present polymerization conditions. The Al compounds affected the polymer yield in the order of Al(i-Bu)(3 )> MMAO > Al(i-Bu)(2)H. MMAO as cocatalyst afforded polyisoprene with high Mn over 1.0 ℅10(6), whereas as stronger chain transfer agent than MMAO, Al(i-Bu)(3) and Al(i-Bu)(2)H yielded polymers with low Mn (1.0 ℅10(5)-8.0℅ 10(5)). NdCl(3﹞)3(i)PrOH/MMAO catalyst showed a fairly good catalytic activity even at relatively low [Al]/[Nd] ratio of 30, and the produced polymer remained high cis-1,4 content of 95.8% along with high Mn over 1.0℅10(6) even at elevated temperatures up to 70(羊)C. The polymerization rate is of the first order with respect to the concentration of isoprene. The mechanism of active species formation was discussed preliminarily. Sun, 20 Mar 2010 17:03:21 GMT Papers Yu-jing Tang (a), Zhi-yong Jiang a, Hans-Friedrich Enderle (b), Dieter Lilge (b), Stephan V. Roth (c), Rainer Gehrke (c), Jens Rieger d, Li-jia An (a), Yong-feng Men(a) /qikan/cpaper/zhaiyao.asp?bsid=7572 The structural changes around a crack tip in a high density polyethylene were investigated by means of scanning synchrotron microfocus small-angle X-ray scattering technique. The scattering data confirm the process of craze structure development near a crack tip based on the evolution of voids. In addition, it was found that the main stress in the plastic zone near a crack tip exhibited a gradient distribution with respect to its strength and direction. The whole damaged area showed a strain distribution indicating a flow behavior toward the crack tip. Sun, 20 Mar 2010 17:03:21 GMT Papers Tang-ying Song, Chen Yao , Xin-song Li /qikan/cpaper/zhaiyao.asp?bsid=7573 Zein/chitosan composite fibrous membranes were fabricated from aqueous ethanol solutions by electrospinning. Poly(vinyl pyrrolidone) (PVP) was introduced to facilitate the electrospinning process of zein/chitosan composites. The as-spun zein/chitosan/PVP composite fibrous membranes were characterized by scanning electron microscopy (SEM) and tensile tests. SEM images indicated that increasing zein and PVP concentrations led to an increase in average diameters of the composite fibers. In order to improve stability in wet stage and mechanical properties, the composite fibrous membranes were crosslinked by hexamethylene diisocyanate (HDI). The crosslinked composite fibrous membranes showed slight morphological change after immersion in water for 24 h. Mechanical tests revealed that tensile strength and elongation at break of the composite fibrous membranes were increased after crosslinking, whereas Young＊s modulus was decreased. Sun, 20 Mar 2010 17:03:21 GMT Papers Ze Zhang( a, b), Qing-ping Song( a), Guan-wu Wang (b) /qikan/cpaper/zhaiyao.asp?bsid=7574 After tentative ring-opening cross metathesis (ROCM) of endo-bicyclo[3.2.0]hept-6-en-3-yl 4-bromobenzoate with PhCHˊCH(2 )initiated by (Cy(3)P)(2)Cl(2)RuˊCHPh in CH(2)Cl(2), ring-opening metathesis polymerization (ROMP) of a series of endo-bicyclo[3.2.0]hept-6-en-3-yl benzoates was achieved under the same conditions, furnishing a variety of the corresponding polymers. Then some of them were selected to hydrogenate the CˊC double bonds in their backbone with p-tosylhydrazide, affording saturated and thus more flexible polymers. All of these polymers were well characterized by spectroscopic means including GPC, UV-Vis, NMR and IR, based on which the tacticity of these polymers was investigated together with nonlinear optical (electric-field-induced second-harmonic generation, EFISH)) analysis. Sun, 20 Mar 2010 17:03:21 GMT Papers Pradeep Kumar Upadhyay , Afaq Ahmad /qikan/cpaper/zhaiyao.asp?bsid=7575 The synthesis, characterization, thermal degradation and stability of polyaniline (PANI), poly(m-nitroaniline), poly(m-chloroaniline) and poly(o-methylaniline) were reported. Different properties were measured and compared with PANI to find out the effect of electron donating groups (求CH(3)) and electron withdrawing groups (求Cl, 求NO(2)). It was found that the presence of any type of substitution in the benzene ring of aniline increased the solubility but reduced the yield, thermal stability and electrical conductivity. Two probe methods were used to measure the electrical conductivity of these polymers. The structural properties of these polymers were characterized by using FTIR and UV-Vis spectroscopic methods. Thermal degradation and stability of these polymers were explained by using thermogravimetric analysis (TGA) and conductivity measurements. Sun, 20 Mar 2010 17:03:21 GMT Papers Ling-ling Zhang, Fei Gao, Can-feng Wang, Jian Zhang, Fa-rong Huang, Lei Du /qikan/cpaper/zhaiyao.asp?bsid=7576 A series of poly[(methylsilylene ethynylenephenyleneethynylene)-co-(dimethylsilylene ethynylenephenylenee-thynylene)]s were synthesized by the incorporation of various ratios of methylsilylene to dimethylsilylene units into the polymer chain backbone. The resultant copolymers were soluble in a variety of common organic solvents at room temperature. The copolymers were characterized by FT-IR, 1H-NMR, GPC, rheological analysis, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results showed that the copolymers exhibited good processability and cured at low temperatures like 200∼C. The curing reactions involved in hydrosilylation of Si求H and alkyne groups and the polymerization of alkynes. Td5 (5% weight loss) of the cured copolymers ranged from 629∼C to 686∼C, and the decomposition residues of cured copolymers at 1000∼C ranged from 88.1% to 90.9% under nitrogen. Thermal stability of the copolymers increased with the introduction of methylsilylene units into polymer chains. The cured copolymers were sintered at 1450∼C, and the results of X-ray diffraction analysis showed that 汕-SiC was for med in the sintered products. Sun, 20 Mar 2010 17:03:21 GMT Papers Wen-qin Lu, Meng-bo Luo /qikan/cpaper/zhaiyao.asp?bsid=7577 The number of configurations, c(n, m), of a single chain with length n attached to a flat surface with m monomers contacting the surface is exactly enumerated. A function of c(n, m) about m and n is obtained. From the function, a scaling law for mean energy of chain is derived, and we estimate the critical point 汍(c) = 0.276 and the crossover exponent f = 0.5. The free energy difference between tethered chain and free chain in dilute solution is also studied, which shows the critical adsorption point is about 0.272 for infinite long chain with f = 0.5. Sun, 20 Mar 2010 17:03:21 GMT Papers Chuan-hua Gao (a, b), Meng-yi Chen (c), Jia-ni Ni( a, b), Ji-jun Hua (a, b), Xiao-ming Xu (a, b), Wei-wei Lin (a, b), Qiang Zheng (a, b ) /qikan/cpaper/zhaiyao.asp?bsid=7578 A series of stable waterborne polysiloxaneurethane (WPSUR) dispersions were prepared using amino-terminated polydimethylsiloxane (NS), dimethylolpropionic acid (DMPA), castor oil, polypropylene glycol and toluene diisocyanate. Meanwhile, NS with different molecular weights was synthesized and used as the soft co-segment. Effects of types and contents of soft co-segments as well as chain extenders on the thermal degradation and stability for WPSUR films were examined. Results reveal that WPSUR films exhibit excellent water resistance and mechanical properties as compared with pure polyurethane (PU) films, and the NS soft co-segment possesses a remarkable effect on the second stage (stage II), while the content of the hard segment is propitious to the initial stage (stage I). Moreover, the highest temperature of stage II (T(2m)) for WPSUR films using NS as soft co-segment is 413(羊)C, approximately being 30(羊)C higher than that of those typical PUs using HDA and APDMS as the chain extenders, respectively. Sun, 20 Mar 2010 17:03:21 GMT Papers Jin-nan Wang (a, b), Ai-min Li (a, b), Li Xu (a, b), Yang Zhou( a, b) /qikan/cpaper/zhaiyao.asp?bsid=7579 Tannic acid and its related compounds are known as refractory organic pollutants, and it can create serious problems for the environment. The adsorption and desorption studies of tannic acid on commercial resins XAD-7 and D-201 are performed, and all data indicates resin XAD-7 can be used as an effective adsorbent for removing tannic acid during water/wastewater treatment. Furthermore, adsorption thermodynamics studies indicate different adsorption mechanisms for TA on XAD-7 and D-201. FT-IR and solid state (13)C-NMR spectroscopy are used to explain the adsorption force between XAD-7 and TA. It suggests that hydrogen bonding is the main adsorption force for TA. Finally, XAD-7＊s adsorption capacity in the presence of different metal ions is investigated, which indicates that heavy metal ions in solutions can decrease the adsorption capacity for TA on ester resin XAD-7. Sun, 20 Mar 2010 17:03:21 GMT Papers Jing-ping Wang, Shu-he Tang, Zheng-hao Fei, Jian Chen, Yu-feng Sun /qikan/cpaper/zhaiyao.asp?bsid=7580 Two hypercrosslinked polymeric adsorbents (ZH-01 and Amberlite XAD-4 resin) were employed to remove three kinds of phenolic compounds including phenol, 4-nitrophenol and 2,4-dinitrophenol from aqueous solutions. The study was focused on the static equilibrium adsorption behavior, the column dynamic adsorption and desorption profiles. The Freundlich model gave a perfect fitting to the isotherm data. The adsorbing capacities for these three compounds on ZH-01 were higher than those on Amberlite XAD-4 within the temperature range 288-318 K, which was attributed to the large micropore area and 2-carboxybenzoyl functional groups on the network of ZH-01 resin. The adsorption for phenol and 4-nitrophenol on ZH-01 was a physical adsorption process, while for 2,4-dinitrophenol it was a coexistence process of physical adsorption and chemisorption＊s transitions. The column test showed the advantages of ZH-01 in the dynamic adsorption processes of phenolic compounds. Being used as the desorption reagent, sodium hydroxide solution showed an excellent performance. Sun, 20 Mar 2010 17:03:21 GMT Papers Run Su, Ke Wang, Qin Zhang, Feng Chen, Qiang Fu /qikan/cpaper/zhaiyao.asp?bsid=7581 The phase morphology and thermal behavior of various isotactic polypropylene (PP)/linear low density polyethylene (LLDPE) blends were investigated with aid of scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), respectively. The effect of barrel (melt) temperature on the morphology, thermal behavior and the resultant mechanical properties of the injection molded bars was the research focus, and the influence of LLDPE composition was also taken into account. It was found that the mechanical properties, especially the tensile ductility and the impact strength, were greatly affected by the processing temperature. The samples obtained at low temperatures had the highest elongation at break and impact strength, while those molded at high temperatures had the poorest toughness. Two reasons were responsible for that: first, the phase size in the samples increased with the processing temperature; second, possible orientation existed in the samples obtained at low processing temperatures. Sun, 20 Mar 2010 17:03:21 GMT Papers Yan Guan, Yi-jun Zheng, Jia-xi Cui , Xin-hua Wan /qikan/cpaper/zhaiyao.asp?bsid=7582 A novel dualfunctional monomer, 2-(2∩,2∩,6∩,6∩-tetramethyl-piperidinyl-1∩-oxy)methylbenzene-1,4-dioyl chloride hydrochloride, with two acid chloride groups for step-growth polymerization and a nitroxide group for the mediation of living radical polymerization was synthesized. It was first copolymerized with terephthaloyl chloride and p-phenylenediamine at a feed molar ratio of 1:3:4 in N-methyl-2-pyrrolidone containing 10 wt% calcium chloride at -10∼C to yield a poly(p-phenylene terephthalamide) based macroinitiator, which initiated radical polymerization of styrene at 125∼C to obtain a series of poly(p-phenylene terephthalamide)-g-polystyrenes. A combinatory analysis of proton nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, elementary analysis, thermogravimetry and gel permeation chromatography indicated that the macroinitiator induced the radical polymerization of styrene to proceed in a well-controlled way. The molecular weight of side-chains increased with an increase of monomer conversion, and the molecular weight distribution index remained lower than 1.5. The graft copolymers showed a remarkably improved solubility in N-methyl-2-pyrrolidone and much depressed crystallinity in bulk. Sun, 20 Mar 2010 17:03:21 GMT Notes Hao-yu Zhang,Xin-yang Li, Xiao-gong Wang /qikan/cpaper/zhaiyao.asp?bsid=7583 Nanomechanical properties of multilayer films constructed of polyaniline (PANI) and azobeneze-containing polyelectrolytes (PNACN and PPAPE) were studied by using nanoindentation method. The multilayer films were prepared by the electrostatic layer-by-layer self-assembly through alternately dipping in the polymer solutions. The multilayer films deposited onto the glass slides after proper dry were used for the nanomechanical property testing. The nanomechanical measurement indicated that the PANI/PNACN and PANI/PPAPE multilayers possessed the mean elastic modulus of 5.42 GPa and 4.35 GPa, and hardness of 0.26 GPa and 0.18 GPa, respectively. The nanoscratch properties of the PANI/PNACN and PANI/PPAPE multilayer films were also measured. The critical loads of PANI/PNACN and PANI/PPAPE films were 103.52 mN and 100.59 mN. The degree of electrostatic cross-linking in the multilayers could be altered by exposing the films to aqueous solutions with different pH values. As a result, the modulus and hardness of the multilayer films were changed through the solvent treatment. Both modulus and hardness of the PANI/PNACN films obviously increased after dipping the multilayer films in solutions with pH in a range from 9 to 11. Sun, 20 Mar 2010 17:03:21 GMT Papers Bo Huang, Feng Bai, Xin-lin Yang, Wen-qiang Huang /qikan/cpaper/zhaiyao.asp?bsid=7584 Monodisperse hollow polymer microspheres having various functional groups on the shell-layer, such as carboxylic acid, pyridyl and amide, were prepared by two-stage distillation precipitation polymerization in neat acetonitrile in the absence of any stabilizer or additive, during which monodisperse poly(methacrylic acid) (PMAA) afforded from the first-stage polymerization was utilized as the seeds for the second-stage polymerization. The shell layer with different functional groups was formed during the second-stage copolymerization of either divinylbenzene (DVB) or ethyleneglycol dimethacrylate (EGDMA) as crosslinker and the functional comonomers, in which the hydrogen-bonding interaction between the carboxylic acid group of PMAA core and the functional groups of the corresponding comonomers, including carboxylic acid, amide and pyridyl, played an essential role for the formation of monodisperse core-shell functional microspheres. The hollow polymer microspheres were then developed after the subsequent removal of PMAA cores by dissolution in ethanol under basic condition. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to determine the morphology of the resultant PMAA core, functional core-shell microspheres and the corresponding hollow polymer microspheres with different functional groups. FT-IR spectra confirmed the successful incorporation of the various functional groups on the shell layer of the hollow polymer microspheres. Sun, 20 Mar 2010 17:03:21 GMT Papers Bin Jing, Jia-xi Wang, Xiao-yan Li, Hui-ying Shi, Xiao-wei Hou, Xing-quan Xiong, Lin Cheng /qikan/cpaper/zhaiyao.asp?bsid=7585 Based on several unsymmetrical, twist, noncoplanar phthalazinone-containing monomers 2a-2e and an active bis(4-fluorophenyl)phenyl phosphine oxide (BFPPO) monomer, a series of novel poly(phthalazinone ether phosphine oxide)s (PPEPO) was synthesized by anhydrous K(2)CO(3) mediated N求C coupling reaction in DMAc. The polymers exhibited good thermal properties with T(g)s ranging from 267∼C to 306∼C and 5% weight loss temperatures in nitrogen higher than 430∼C, together with high char yield upon prolonged heating at 800∼C (35%-56%). Moreover, the polymers were readily soluble in common organic solvents, such as N-methyl-2-pyrrolidone, chloroform and m-cresol. These polymers had inherent viscosities in the range of 0.45-0.72 dL/g and could be cast into flexible and colorless films by spin coating or casting approach. Sun, 20 Mar 2010 17:03:21 GMT Notes Cheng-guo Liu (a), Hong-feng Xie (a), Zhi-liu Wang (a), Hu Yang( a), Rong-shi Cheng (a, b) /qikan/cpaper/zhaiyao.asp?bsid=7607 Base on the principle of absolute quantification of size exclusion chromatography (SEC), a light scattering (LS) detector coupled with a concentration detector (refractive index detector) is utilized to determine the compositions of complicated binary mixtures. A theoretical analysis predicts that the response factors for both LS and RI detectors are linear functions with the composition of any specified polymer mixtures in the binary polymer mixtures. Two pairs of complicated binary mixtures were used to test the theory mentioned in the present paper, and the experimental results show an excellent accordance with the theory. Fri, 20 May 2010 17:03:21 GMT Rapid Communication Ahmed Aouissi, Salim Salem Al-Deyab, Hassan Al-Shehri /qikan/cpaper/zhaiyao.asp?bsid=7609 Three Keggin-type heteropolyanions, namely H(3)PMo(12)O(40﹞)13H(2)O, (NH(4))(3)PMo(12)O(40﹞)4H(2)O and H(3)PW(12)O(40﹞)13H2O were prepared and tested in the ring-opening polymerization reaction of tetrahydrofuran. The effects of the counter-cation (H(+), NH(4)(+)) and the peripheral atoms (Mo, W) on the polymerization were investigated. It has been found that when the protons of H(3)PMo(12)O(40﹞)13H(2)O were replaced by the ammonium cations the polymerization rate decreased dramatically. Whereas, when the peripheral atoms (Mo) were replaced by their homologous (W), the polymerization rate increased twofold. As for the viscosity average molecular weight (Mv) of polymer products, it was found that the high molecular weight (7930) was obtained by using H(3)PW(12)O(40﹞)13H(2)O. The molecular weight (Mv) obtained by H(3)PMo(12)O(40﹞)13H(2)O and (NH(4))(3)PMo(12)O(40﹞)4H(2)O was 6470 and 6810, respectively. Fri, 20 May 2010 17:03:21 GMT Papers Su-yun Jie, Wen-hua Sun, Tianpengfei Xiao /qikan/cpaper/zhaiyao.asp?bsid=7608 The discovery of highly active 2,6-bis(imino)pyridyl iron and cobalt complexes provided a milestone of late-transition metal catalysts for ethylene oligomerization and polymerization with being currently investigated for the scale-up process. The crucial problems are remaining in the catalytic systems: the catalytic systems targeting ethylene polymerization produce more oligomers at elevated reaction temperatures, however, there is a recognizable amount of high-molecular-weight polyethylene remained in the modified catalytic system for the oligomerization process. Beyond the modification of bis(imino)pyridyl metal complexes, several alternative procatalysts＊ models have been developed in our group. This review highlighted the achievements in exploring new iron and cobalt complexes with tridentate NNN ligands as procatalysts for ethylene oligomerization and polymerization. Fri, 20 May 2010 17:03:21 GMT Feature Article Miao-miao Xiao (a), Bin Tong( a), Wei Zhao (a), Jian-bing Shi (a), Yue-xiu Pan (a), Jin-bo Shen (a), Jun-ge Zhi (b), Yu-ping Dong (a ) /qikan/cpaper/zhaiyao.asp?bsid=7611 The stability of full-conjugated self-assembled (SA) multilayer films based on partially doped polyaniline (PANI) as a polycation and poly(o-aminobenzoic acid) (PCAN), poly(aniline-2-sulfonic acid) (PSAN) as polyanions is investigated in alkali aqueous solutions. The self-assembled PANI-PCAN films keep their stability within 24 h in 1 mol/L NaOH solution, the PANI-PSAN films, however, maintain the stability for 20 min in the same condition because the solubility of PSAN in alkali solutions is much higher than that of PCAN. The electrochemical properties of the SA films are determined, and the film-CdS composites formed in situ are also reported. Fri, 20 May 2010 17:03:21 GMT Papers Jin Chen,Zhi-yong Huang /qikan/cpaper/zhaiyao.asp?bsid=7610 Three-dimensional Monte Carlo simulations of comb-like polymer chains with various backbone lengths N(b), arm lengths N(a )and arm densities m are carried out to study the elastic behavior of comb-like polymer chains. The radius of gyration, the shape factors and bond length in different cases during elastic process are calculated, and it is found that the comb-like polymer molecules with longer backbone or shorter arm are more close to linear chains. But the arm density m affects the chain conformation non-monotonously. Some thermodynamic properties are also studied. Average Helmholtz free energy and elastic force f all increase with elongation ratio  for all chains. Fri, 20 May 2010 17:03:21 GMT Papers Ying-ying Pan( a, b), Xi-fei Yu (a), Tong-fei Shi (a),Li-jia An (a) /qikan/cpaper/zhaiyao.asp?bsid=7614 A series of H-shaped (PS)(2)PEG(PS)(2) block copolymers with different PS chain lengths were prepared. The influence of different confinements active on the crystallization and self-nucleation (SN) behavior of the PEG blocks was investigated by differential scanning calorimetry (DSC). When the content of the crystalline block was high, a classical SN behavior was obtained. The block copolymer with PEG content of 49% (by weight) showed a classical SN behavior with a narrow self-nucleation domain and had bimodal crystallization exotherms. When the PEG dispersed as separated microdomains in the block copolymer, the self-nucleation domain disappeared and only annealing was observed. Fri, 20 May 2010 17:03:21 GMT Papers Shu-jun Liang a, b, c, Jian-ping Deng b, c , Wan-tai Yang b, c /qikan/cpaper/zhaiyao.asp?bsid=7612 Synthesis and characterization of the copolymers (PAG) of汐-methyl styrene (AMS) and glycidyl methacrylate (GMA) are presented. The copolymers of PAG were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and thermogravimetery (TG). Based on the copolymer compositions determined by (1)H-NMR, the reactivity ratios of AMS and GMA were found to be 0.105 ㊣ 0.012 and 0.883 ㊣ 0.046 respectively by Kelen-T邦dös method. TG revealed that thermal stability of the copolymers decreased with increasing the AMS content in the copolymers, which indicated that the degradation was mainly caused by the chain scission of AMS-containing structures. Under heating, the copolymers depolymerize at their weak bonds and form chain radicals, which could further initiate other chemical reactions. Fri, 20 May 2010 17:03:21 GMT Papers Mei Zhang a, b, Chun-fang Zhang a, Zhi-kan Yao a, Jun-li Shi a, Bao-ku Zhu a, You-yi Xu a /qikan/cpaper/zhaiyao.asp?bsid=7613 High density polyethylene (HDPE)/polyethylene-block-poly(ethylene glycol) (PE-b-PEG) blend porous membranes were prepared via thermally induced phase separation (TIPS) process using diphenyl ether (DPE) as diluent. The phase diagrams of HDPE/PE-b-PEG/DPE systems were determined by optical microscopy and differential scanning calorimetry (DSC). By varying the content of PE-b-PEG, the effects of PE-b-PEG copolymer on morphology and crystalline structure of membranes were studied by scanning electron microscopy (SEM) and wide angle X-ray diffraction (WAXD). The chemical compositions of whole membranes and surface layers were characterized by elementary analysis, Fourier transform infrared spectroscopy-attenuated total reflection (FTIR-ATR) and X-ray photoelectron spectroscopy (XPS). Water contact angle, static protein adsorption and water flux experiments were used to evaluate the hydrophilicity, antifouling and water permeation properties of the membranes. It was found that the addition of PE-b-PEG increased the pore size of the obtained blend membranes. In the investigated range of PE-b-PEG content, the PEG blocks could not aggregate into obviously separated domains in membrane matrix. More importantly, PE-b-PEG could not only be retained stably in the membrane matrix during membrane formation, but also enrich at the membrane surface layer. Such stability and surface enrichment of PE-b-PEG endowed the blend membranes with improved hydrophilicity, protein absorption resistance and water permeation properties, which would be substantially beneficial to HDPE membranes for water treatment application. Fri, 20 May 2010 17:03:21 GMT Papers Xu-juan Li, Gan-ji Zhong, Zhong-ming Li /qikan/cpaper/zhaiyao.asp?bsid=7615 The non-isothermal crystallization of poly(L-lactide) (PLLA) under quiescent and steady shear flow conditions was in situ investigated by using polarizing optical microscopy (POM) with a hot shear stage and wide-angle X-ray diffraction (WAXD). The shear rate and the cooling rate both play a significant role in the final crystalline morphology and crystallinity. Under quiescent conditions, the morphology assumes different sized spherulites, and its crystallinity dramatically reduces with increasing the cooling rate. On the other hand, the shear flow increases the onset crystallization temperature, and enhances the final crystallinity. When the shear rate is above 5 s(-1), cylindrite-like crystals are observed, furthermore, their content depends on the cooling rate. Fri, 20 May 2010 17:03:21 GMT Papers Xue-ping Wu a, Xian-long Zhang b, Chun-xiang Lu a, Li-cheng Ling c /qikan/cpaper/zhaiyao.asp?bsid=7616 Thermal properties of acrylonitrile (AN)-acrylamide (AM) copolymers for carbon fibers were studied by DSC and in situ FTIR techniques in nitrogen (N(2)) and air flows. The cyclization mechanism and stabilization behavior of polyacrylonitrile (PAN) were discussed. In N(2) flow, it was found that AM had the ability to initiate and accelerate cyclization process, which was confirmed by the fact that the initiation of nitriles shifted to a lower temperature. Compared to AN homopolymer, the initiation temperature of cyclization was ahead 32 K by introducing 3.59 mol% AM into the copolymer. The exothermic reaction was relaxed due to the presence of two separated exothermic peaks. Accompanied by DSC, in situ FTIR and calculation of activation energy, the two peaks were proved to be caused by ionic cyclization and free radical cyclization, respectively, and the corresponding cyclization mechanism was proposed. With increasing in AM content, the ionic cyclization tends to be dominant and the total heat liberated first increases and then decreases. For AN homopolymer, the activation energy of cyclization is 179 kJ/mol. For AN-AM copolymer (containing 3.59 mol% AM), the activation energy of ionic cyclization is 96 kJ/mol and that of free radical cyclization is 338 kJ/mol. In air flow, similar cyclization routes occur and the difference is the contribution of oxidation. The oxygen in environment has no remarkable effect on cyclization of AN homopolymer but retards the cyclization of AN-AM copolymers. For AN-AM copolymer with 3.59 mol% AM, the cyclization temperature is postponed 10∼C in air. Fri, 20 May 2010 17:03:21 GMT Papers Xiu-qin Zhang, Bao-quan Xie, Rong-bo Li, Lei Kong, Du-jin Wang /qikan/cpaper/zhaiyao.asp?bsid=7617 Syndiotactic polypropylene (sPP) as-spun fiber (sPP1) and drawn fiber (sPP2) were prepared by melt-spinning and melt-spinning/hot-drawing, respectively. The structure transition of the two fibers induced by annealing at different temperatures and the corresponding mechanical properties were subsequently investigated by the combination of Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD) and tensile testing. The results indicate that the chain conformation and crystal forms of the two sPP fibers are not obviously changed at low annealing temperature (40∼C). With increasing the annealing temperature, the trans-planar conformation and mesophase in sPP1 and sPP2 fibers can be completely transformed to helical conformation and crystal form I under tension. Upon removing the tension, a small amount of mesophase and trans-planar conformation will be regained. The mechanical properties of the annealed fibers are manifestly dependent on their initial structure and the annealing temperature. Fri, 20 May 2010 17:03:21 GMT Papers Jiang-wei Zhao, Han Zhu, Yi-xian Wu, Rui Jian, Guan-ying Wu /qikan/cpaper/zhaiyao.asp?bsid=7618 FTIR spectroscopy in combination with a diamond tipped attenuated total reflectance (ATR) immersion probe was utilized to study in situ the copolymerization of butadiene (Bd) and isoprene (Ip) with neodymium-based catalyst in hexane. The relationship between the signal intensity of monomer and its concentration was investigated. The kinetic study of copolymerization of Bd and Ip was further conducted, and the monomer reactivity ratios were determined via in situ ATR FTIR. The signal band at 1010 cm(-1) was assigned to wagging vibration of Bd and its intensity was proportional to Bd concentration ([Bd]) in the range of 0.46-3.88 mol﹞L(-1). The signal bands at 890 and 989 cm(-1) were assigned to wagging vibration of Ip and the signal intensity was also proportional to Ip concentration ([Ip]) in the range of 0.08-4.73 mol﹞L(-1) at 890 cm(-1) and 0.08-7.49 mol﹞L(-1) at 989 cm-1, respectively. Thus the signal band at 1010 cm(-1 )was chosen to monitor Bd concentration and bands at 989 and 890 cm(-1) to monitor Ip concentration during the copolymerization, respectively. It was demonstrated that the conversions of Bd and Ip calculated from FTIR data agreed very well with those obtained gravimetrically. The polymerization rates were first order with respect to both [Bd] and [Ip], respectively at different polymerization temperatures. The apparent propagation activation energy for Bd and Ip could be determined to be 54.4 kJ﹞mol(-1) and 57.7 kJ﹞mol(-1), respectively. The monomer reactivity ratios were calculated to be 1.08 for Bd (rBd) and 0.48 for IP (rIp) based on FTIR data. The Bd-Ip copolymer products with random sequence could be obtained with only one glass transition temperature. Fri, 20 May 2010 17:03:21 GMT Papers Xin-jun Zhang, Fei Yuan, Yong-liang Wang, Zi-jian Zhang, Wei Wang /qikan/cpaper/zhaiyao.asp?bsid=7619 Three dendronized polymers from generation one to generation three have been prepared by complexing negatively charged Fr谷chet-type dendrons with a polyanion, poly(diallydimethylammonium chloride) (PDADMAC). The grafting degree has been confirmed mainly by elemental analysis. In dilute solutions of tetrahydrofuran, static light scattering studies indicate that the first generation complex has a coil-like conformation, even more flexible than PDADMAC. The second and third generation complexes exhibit polyelectrolyte behavior. Dynamic light scattering experiments indicate that all the three complexes have almost the same hydrodynamic radius, indicating that they might own similar coil conformation. Atomic force microscopy shows the existence of disordered globules formed by one or a couple of complex coils. All these observations can be explained by the flowerlike coil conformation, which is formed by the intra-molecular association. This is totally different from the stretched chain conformation formed by covalently connected dendronized polymers. This result also explains why some ordered supramolecular structures, found in condensed state of the similar complexes, are not as perfect as those of conventional dendronized polymers. Fri, 20 May 2010 17:03:21 GMT Papers Bing-tao Wang (a, b), Yan Zhang( b), Ping-an Song (a, b), Zheng-hong Guo (b), Jie Cheng( b), Zheng-ping Fang( a, b) /qikan/cpaper/zhaiyao.asp?bsid=7621 Biodegradable aliphatic/aromatic copolyesters, poly(butylene terephthalate-co-lactate) (PBTL) were prepared via direct melt polycondensation of terephthalic acid (TPA), 1,4-butanediol (BDO) and poly(L-lactic acid) oligomer (OLLA). The effects of polymerization time and temperature, as well as aliphatic/aromatic moiety ratio on the physical and thermal properties were investigated. The largest molecular weight of the copolyesters was up to 64100 with molecular weight distribution index of 2.09 when the polycondensation was carried out at 230∼C for 6 h. DSC, XRD, DMA and TGA analysis clearly indicated that the degree of crystallinity, glass-transition temperature, melting point, decomposition temperature, tensile strength, elongation and Young＊s modulus were influenced by the ratio between TPA and OLLA in the final copolyesters. Hydrolytic degradation results demonstrated that the incorporation of biodegradable lactate moieties into the aromatic polyester could efficiently improve hydrolytic degradability of the copolymer even though it still had many aromatic units in the main chains. Fri, 20 May 2010 17:03:21 GMT Papers Hao Wang( a, c), Hong-rui Song( b), Xue-si Chen( c), Ying-jie Deng (a) /qikan/cpaper/zhaiyao.asp?bsid=7620 Poly(汐-hydroxy octanoic acid) was first used as an additive for the preparation of electrospun ultra-fine fibers of poly(ethylene glycol)-b-poly(L-lactide) (PEG-PLLA). Ibuprofen was loaded in the electrospun ultra-fine fibers. The results from environmental scanning electron microscopy (ESEM), wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) demonstrated that ibuprofen could be perfectly entrapped in the fibers electrospun from PEG-PLLA using 汐-hydroxy octanoic acid or PEG-b-poly(汐-hydroxy octanoic acid) (PEG-PHOA) as additives. Compared with electrospun PEG-PLLA fibers which entrapped 20 wt% ibuprofen, the PEG-PLLA electrospun fibers containing PEG-PHOA exhibited integral and robust after 1 week incubated in 37∼C, pH 7.4 phosphate buffer solution with 10 米g/mL proteinase K. Compared with electrospun fibers without PEG-PHOA, the concentration of proteinase K in release media had less effect on the release rate of ibuprofen. An unique release profile was found from PEG-PLLA fiber after the incorporation of PEG-PHOA. Enzyme degradation experiments demonstrated that PEG-PHOA but not 汐-hydroxy octanoic acid monomer was the crucial factor for integrity maintenance of the electrospun fibers, which may be due to the enzyme degradation tolerance property of the PEG-PHOA polymer additive. Fri, 20 May 2010 17:03:21 GMT Papers Jin-nan Wang a, b, Yang Zhou a, b, Ai-min Li a, b, Li Xu a, b, Ling Xu a, b /qikan/cpaper/zhaiyao.asp?bsid=7622 Adsorption of humic, tannic and gallic acids by a macro weakly basic ion-exchange resin JN-01 was studied. The adsorption capacity of this resin for gallic and tannic acids is much higher than that for humic acid, which can be explained on the basis of both their molecular size and ionization degree. Furthermore, humic acid is separated into different components with molecular weight in the range from 2000 Da to 100000 Da by ultra-filter, and their adsorption isotherms on resin JN-01 indicate that humic acid＊s molecular weight is an important factor which makes significant influence on adsorption. Finally, changes in the amount of Cu(2+) and Pb(2+) adsorbed on resin JN-01 as a function of the concentration of each of these three acids were studied. A large increase in the heavy metal ions uptake is observed in the presence of humic substance, such advantages are due to the interactions between the heavy metal ions and the unbound functional groups of the adsorbed organic acids. Fri, 20 May 2010 17:03:21 GMT Papers Jing-jing Yan, Wen-xi Ji, Er-qiang chen, Zi-chen Li, De-hai Liang /qikan/cpaper/zhaiyao.asp?bsid=7623 The effects of heating rate on the aggregate behavior of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) in aqueous solutions were investigated in detail by laser light scattering and TEM. By employing two separate heating protocols, step-by-step heating at < 5 K/step and one-step jump, to heat the sample from 15(o)C to the selected temperature, we found that the heating rate only showed significant effect on the aggregates above the cloud point. The aggregate formed by step-by-step heating exhibited a much larger size and a broader size distribution than those formed by one-step jump heating. Moreover, neither of the aggregates were ideal micellar structures as indicated by the size and the R(g)/R(h) values. On the contrary, at temperatures below the cloud point where the block copolymer formed core-shelled micelles, the heating rate showed negligible effect on the size and size distribution of the micelles. Since the system underwent a phase separation above the cloud point, the heating rate effect could be reasonably explained by the phase separation mechanisms: the nucleation-and-growth mechanism in the metastable region and the spinodal decomposition mechanism in the unstable region. Fri, 20 May 2010 17:03:21 GMT Papers Qing-yuan Li, Yi-xian Wu, Wen-yan Ma, Ri-wei Xu, Guan-ying Wu, Wan-tai Yang /qikan/cpaper/zhaiyao.asp?bsid=7624 The copolymerization of 4-vinylbenzyl chloride (VBC) and vinyl acetate (VAC) was carried out in toluene at 75∼C via radical polymerization using 2,2∩-azo-bis-(isobutyronitrile) (AIBN) as an initiator. The random copolymers of poly(4-vinylbenzyl chloride-co-vinyl acetate) (P(VBC-co-VAC)) with number average molecular weight (Mn) from 2000 to 6900, relatively narrow molecular weight distribution (MWD, Mw/Mn ca. 2.0) and with different copolymer composition of 4-vinylbenzyl chloride (VBC) from 17 mol% to 62 mol% could be obtained. The P(VBC-co-VAC) copolymers with an average number of 7 to 13 initiating sites of benzyl chloride per macromolecule could be used for the cationic polymerization of isobutylene (IB). The cationic polymerizations of IB were further conducted by using P(VBC-co-VAC) copolymers as macroinitiators in conjunction with TiCl4 at-40∼C in CH(2)Cl(2). The effects of VBC/TiCl(4) (molar ratio) on monomer conversion, M(n) and MWD of the resultant copolymers were investigated under 3 sets of conditions. It is found that P(VBC-co-VAC)-g-PIB copolymers with relatively narrow MWD (M(w)/M(n) ca. 2.0) and with terminal tert-chlorine functional groups in branched PIB chains could be successfully synthesized when VBC/TiCl(4) (molar ratio) was set in the range from 0.10 to 1.12. The unimodal GPC curve of the P(VBC-co-VAC)-g-PIB copolymers by RI detector was almost in harmony with the GPC curve by UV detector. The TEM image of the P(VBC-co-VAC)-g-PIB copolymer stained by RuO indicated that the copolymer formed a two-phase morphology with P(VBC-co-VAC)-rich domains of 20-100 nm in size tethered by PIB branch segments. Fri, 20 May 2010 17:03:21 GMT Papers