MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China
s_yh0411@zju.edu.cn
收稿:2026-01-04,
录用:2026-02-24,
网络首发:2026-05-20,
纸质出版:2026-07-05
Scan QR Code
Liu, Z. Y.; Song, Y. H.; Zheng, Q. Influence of antioxidants and deep eutectic solvent on vulcanization kinetics and mechanical behaviors of natural rubber/styrene-butadiene rubber blend and composites. Chinese J. Polym. Sci. 2026, 44, 2341–2351
Zi-Ye Liu, Yi-Hu Song, Qiang Zheng. Influence of Antioxidants and Deep Eutectic Solvent on Vulcanization Kinetics and Mechanical Behaviors of Natural Rubber/Styrene-Butadiene Rubber Blend and Composites[J]. Chinese Journal of Polymer Science, 2026, 44(7): 2341-2351.
Liu, Z. Y.; Song, Y. H.; Zheng, Q. Influence of antioxidants and deep eutectic solvent on vulcanization kinetics and mechanical behaviors of natural rubber/styrene-butadiene rubber blend and composites. Chinese J. Polym. Sci. 2026, 44, 2341–2351 DOI: 10.1007/s10118-026-3632-7.
Zi-Ye Liu, Yi-Hu Song, Qiang Zheng. Influence of Antioxidants and Deep Eutectic Solvent on Vulcanization Kinetics and Mechanical Behaviors of Natural Rubber/Styrene-Butadiene Rubber Blend and Composites[J]. Chinese Journal of Polymer Science, 2026, 44(7): 2341-2351. DOI: 10.1007/s10118-026-3632-7.
Deep eutectic solvent (DES) modulates vulcanization kinetics and crosslinking structure; when combined with MB and carbon black (CB)/black talc (BT)
it facilitates the preparation of high-strength natural rubber (NR)/styrene-butadiene rubber (SBR) composites with reduced hysteresis and weakened Mullins effect.
Antioxidants are generally used for prolonging the lifespan of rubber products
while their influences on the vulcanization kinetics and mechanical properties are rarely investigated. Herein
the synergistic roles of conventional antioxidants (6PPD
MB
2246) and deep eutectic solvent (DES) in natural rubber (NR)
styrene-butadiene rubber (SBR)
their blends
and the blends filled with carbon black (CB) and black talc (BT) were examined. The results showed that antioxidants and DES influenced the vulcanization kinetics
crosslinking density and mechanical behaviors markedly. A combination of MB and DES resulted in NR/SBR-CB/BT composite vulcanizates with high strength and low dissipation characteristics. DES formed hydrogen bond/ion-pair complexes with antioxidants
and
in NR
interacted with non-rubber constituents
thereby modulating cure intermediates and sulfur-bond distributions
paving the way for preparing high performance rubber composites.
Kazemi, H.; Mighri, F.; Rodrigue, D. A review of rubber biocomposites reinforced with lignocellulosic fillers. J. Compos. Sci. 2022 , 6 , 183..
Alam, M. N.; Kumar, V.; Jung, H. S.; Park, S. S. Fabrication of high-performance natural rubber composites with enhanced filler-rubber interactions by stearic acid-modified diatomaceous earth and carbon nanotubes for mechanical and energy harvesting applications. Polymers 2023 , 15 , 3612..
[Rajawasam, C. W. H.; Dodo, O. J.; Weerasinghe, M. A. S. N.; Raji, I. O.; Wanasinghe, S. V.; Konkolewicz, D.; Watuthanthrige, N. D. A. Educational series: characterizing crosslinked polymer networks Polym. Chem . 2024, 15 , 219−247..
Sadequl, A. M.; Ishiaku, U. S.; Ismail, H.; Poh, B. T. The effect of accelerator/sulphur ratio on the scorch time of epoxidized natural rubber. Eur. Polym. J. 1998 , 34 , 51−57..
Poschl, M.; Sathi, S. G.; Stocek, R. Identifying the co-curing effect of an accelerated-sulfur/bismaleimide combination on natural rubber/halogenated rubber blends using a rubber process analyzer. Polymers 2021 , 13 , 4329..
Samarasinghe, I. H. K.; Walpalage, S.; Edirisinghe, D. G.; Egodage, S. M. Study on sulfur vulcanized natural rubber formulated with nitrosamine safe diisopropyl xanthogen polysulfide/tertiary butyl benzothiazole sulphenamide binary accelerator system. Prog. Rubber Plast. Recycl. Technol. 2020 , 37 , 190−202..
Charoeythornkhajhornchai, P.; Samthong, C.; Somwangthanaroj, A. Influence of sulfenamide accelerators on cure kinetics and properties of natural rubber foam. J. Appl. Polym. Sci. 2017 , 134 , 44822..
Gaca, M.; Vaulot, C. Effect of fillers modification with ils on fillers textural properties: thermal properties of SBR composites. Int. J. Mole. Sci. 2024 , 25 , 885..
Jung, W.; Cho, S.; Jang, K. Effect of surface-modified mica in hybrid filler systems on the curing and mechanical behavior of ethylene-propylene-diene monomer (EPDM)/butadiene rubber (BR) blend. Polymers 2025 , 17 , 2250..
Jovanovic, V.; Budinski Simendic, J.; Samardzija Jovanovic, S.; Markovic, G.; Marinovic Cincovic, M. The influence of carbon black on curing kinetics and thermal aging of acrylonitrile-butadiene rubber. Chem. Ind. Chem. Eng. Q. 2009 , 15 , 283−289..
Kruzelak, J.; Hlozekova, K.; Kvasnicakova, A.; Tomanova, K.; Hudec, I. Application of sulfur and peroxide curing systems for cross-linking of rubber composites filled with calcium lignosulfonate. Polymers 2022 , 14 , 1921..
Hosseini, S. M.; Razzaghi Kashani, M. Vulcanization kinetics of nano-silica filled styrene butadiene rubber. Polymer 2014 , 55 , 6426−6434..
Hosseini, S. M.; Razzaghi Kashani, M. On the role of nano-silica in the kinetics of peroxide vulcanization of ethylene propylene diene rubber. Polymer 2017 , 133 , 8−19..
Suresh, K.; Megavarnan, R.; Vengatachalam, P.; Krishnamurthy, S.; Balakrishnan, P. A review on the effect of various nano fillers on the mechanical properties and thermal stability of chloroprene rubber composites. Mater. Today Proc. 2022 , 68 , 2560−2568..
Liu, Y.; Li, L.; Wang, Q. Reinforcement of natural rubber with carbon black/nanoclay hybrid filler. Plast Rubber Compos. 2013 , 39 , 370−376..
Abdul Salim, Z. A. S.; Hassan, A.; Ismail, H. A review on hybrid fillers in rubber composites. Polym. Plast. Technol. Eng. 2017 , 57 , 523−539..
Poikelispää, M.; Shakun, A.; Sarlin, E. Nanodiamond—carbon black hybrid filler system for demanding applications of natural rubber—butadiene rubber composite. Appl. Sci. 2021 , 11 , 10085..
Zou, M.; Gao, W.; Li, Z.; Liu, B.; Li, B.; Liu, K.; Liu, J. Hybrid carbon black/silica reinforcing system for high-performance green tread rubber. Polymers 2024 , 16 , 2762..
Vayyaprontavida Kaliyathan, A.; Varghese, K. M.; Nair, A. S.; Thomas, S. Rubber–rubber blends: a critical review. Prog. Rubber Plast. Recycl. Technol. 2019 , 36 , 196−242..
Li, C.; Song, Y. Effects of ionic liquid on strain softening behaviors of silica filled natural rubber/nitrile butadiene rubber nanocomposites. Acta Polymerica Sinica (in Chinese) 2024 , 55 , 1549−1560..
Tang, S.; Li, Z.; Sun, W.; Liu, Y.; Wang, J.; Wang, X.; Lin, J. Natural rubber/styrene-butadiene rubber blend composites potentially applied in damping bearings. Polymers 2024 , 16 , 1945..
Findik, F.; Yilmaz, R.; Köksal, T. Investigation of mechanical and physical properties of several industrial rubbers. Mater. Des. 2004 , 25 , 269−276..
Chen, Q.; Huang, W.; Zhang, L.; Chen, Y.; Liu, J. Impact of sacrificial hydrogen bonds on the structure and properties of rubber materials: insights from all-atom molecular dynamics simulations. Langmuir 2024 , 40 , 11470−11480..
[Hu, R.; Zhao, S.; Chen, F.; Shangguan, Y.; Zheng, Q. Effect of sacrificial bond on molecular dynamics and rheological behavior ofhybrid butadiene-styrene-vinylpyridine rubber vulcanizates with reversible sacrificial network. J. Polym Sci . 2022 , 60 , E1−E12..
Imbernon, L.; Norvez, S. From landfilling to vitrimer chemistry in rubber life cycle. Eur. Polym. J. 2016 , 82 , 347−376..
Denissen, W.; Winne, J. M.; Du Prez, F. E. Vitrimers: permanent organic networks with glass-like fluidity. Chem Sci 2016 , 7 , 30−38..
Langley, N. R. Elastically effective strand density in polymer networks. Macromolecules 2002 , 1 , 348−352..
Han, Q.; Li, X.; Li, Y.; Wu, Y. Influences of the compatibility of NR/SSBR and phase-selective distribution of silica on its static and dynamic properties. Rubber Chem. Technol. 2020 , 93 , 588−604..
Le, H. H.; Hamann, E.; Ilisch, S.; Heinrich, G.; Radusch, H. J. Selective we ttingand dispersion of filler in rubber composites under influence of processing and curing additives. Polymer 2014 , 55 , 1560−1569..
Aswathy, T. R.; Dash, B.; Dey, P.; Nair, S.; Naskar, K. Synergistic effect of graphene with graphene oxide, nanoclay, and nanosilica in enhancing the mechanical and barrier properties of bromobutyl rubber/epoxidized natural rubber composites. J. Appl. Polym. Sci. 2021 , 138 , 50746..
Azizli, M. J.; Barghamadi, M.; Rezaeeparto, K.; Mokhtary, M.; Parham, S.Compatibility, mechanical and rheological properties of hybrid rubber NR/EPDM- g -MA/EPDM/graphene oxide nanocomposites: theoretical and experimental analyses. Compos. Commun. 2020 , 22 , 100442..
Zhao, X.; Niu, K.; Xu, Y.; Peng, Z.; Jia, L.; Hui, D.; Zhang, L. Morphology and performance of NR/NBR/ENR ternary rubber composites. Compos, B 2016 , 107 , 106−112..
Phiriyawirut, M.; Luamlam, S. Influence of poly(vinyl chloride) on natural rubber/chlorosulfonated polyethylene blends. Open J. Org. Polym. Mater. 2013 , 03 , 81−86..
Zhao, H.; Xiang, Y.; Wu, L.; Gao, J. Effect of compatibilizer on properties of chloroprene rubber/natural rubber blends. Polym. Bull. 2022 , 35 , 65−71..
Karekar, A.; Oßwald, K.; Reincke, K.; Langer, B.; Saalwächter, K. NMR studies on the phase-resolved evolution of cross-link densities in thermo-oxidatively aged elastomer blends. Macromolecules 2020 , 53 , 11166−11177..
Sidkey, M. A.; Yehia, A. A.; Abd El Malak, N. A.; Gaafar, M. S. Compatibility studies on some rubber blend systems by ultrasonic techniques. Mater. Chem. Phys. 2002 , 74 , 23−32..
Stabile, P.; Mastinu, G.; Gobbi, M.; Bardini, P. Tire aging: a state-of-the-art review. Eng. Sci. Technol. Int. J. 2025 , 69 , 102101..
Bensalem, K.; Eesaee, M.; Hassanipour, M.; Elkoun, S.; David, E.; Agbossou, K.; Nguyen-Tri, P. Lifetime estimation models and degradation mechanisms of elastomeric materials: a critical review. Polym. Degrad. Stabil. 2024 , 220 , 110644..
Taourit, S.; Gac, P. Y. L.; Bourdet, A.; Van Elslander, A.; Robin, C.; Fayolle, B. Changes in natural rubber mechanical behavior during oxidation: relationship with oxygen consumption. Polym. Degrad. Stabil. 2024 , 225 , 110787..
Xuan, Y. Y.; Ridzuan, M. J. M.; Majid, M. S. A.; Marsi, N.; Rahman, M. T. A.; Yudhanto, F.; Sapuan, S. M. Effect of thermal aging on the tensile and tribological properties of pineapple leaf fiber-reinforced natural rubber composites incorporating multiwalled carbon nanotubes. Polym. Compos. 2025 , 46 , 15637−15651..
Ferradino, A. G. Antioxidant selection for peroxide cure elastomer applications. Rubber Chem. Technol. 2003 , 76 , 694−718..
Xu, J.; Hao, Y.; Yang, Z.; Li, W.; Xie, W.; Huang, Y.; Wang, D.; He, Y.; Liang, Y.; Matsiko, J.; Wang, P. Rubber antioxidants and their transformation products: environmental occurrence and potential impact. Int. J. Environ. Res. Public Health 2022 , 19 , 14595..
Zidan, T. A.; Kandil, H. S. Investigation of novel polyanilines as new antioxidants for ethylene propylene diene monomer rubber composites. J. Appl. Polym. Sci. 2023 , 141 , 54924..
Liu, F.; Liu, Z.; Hou, G.; Lin, G.; Tian, Z.; Zhao, M.; Huang, Z.; Zhang, Y. Improving dispersion of alkali lignin in natural rubber by adopting graphene oxide as a carrier. ACS Appl. Polym. Mater. 2024 , 6 , 10927−10935..
Xie, X.; Wu, L.; He, J.; Liu, F. Preparation of chitosan-based macromolecular antioxidant with high-efficiency free radical scavenging ability to improve the antioxidative properties of styrene-butadiene rubber/silica composites. Compos. Commun. 2024 , 51 , 102098..
Zhao, W.; He, J.; Yu, P.; Jiang, X.; Zhang, L. Recent progress in the rubber antioxidants: a review. Polym. Degrad. Stabil. 2023 , 207 , 110223..
Yang, L.; Sun, S.; Yu, X.; Xu, Z.; Lu, Y.; Shi, X.; Song, Y.; Wang, D.; Zuo, M.; Zheng, Q. Effect of deep eutectic solvents on vulcanization kinetics and strain-softening behavior of natural rubber/styrene-butadiene rubber. Polymer 2025 , 316 , 127871..
Li, Q.; Liu, B.; Hu, Z.; Jiang, X.; Yang, L.; Meng, H.; Song, Y.; Zheng, Q. Preparation of deep eutectic solvents based on metal ions and their influences on reinforcement and strain sof tening behaviors of silica filled natural rubber nanocomposites. Compos, A 2024 , 181 , 108119..
Flory, P. J.; Rehner, J. Statistical mechanics of cross-linked polymer networks. II. Swelling. J. Chem. Phys. 1943 , 11 , 521−526..
Dzulkifli, A. I.; Said, C. M. S.; Han, C. C.; Mohd, A. F. Rubber-solvent interaction parameter ( χ 1,2 ) of NR/SBR rubber blend solution in determination of crosslink concentration for vulcanized rubber blend. Adv. Mater. Res. 2015 , 1134 , 75−81..
Guo, Y.; Han, D.; Tian, X.; Ma, D.; Wu, X.; Han, D.; Yang, N.; Zhang, J. Quantitative determination of non-rubber components and construction of supramolecular network aggregation state structure of natural rubber. Ind. Crops Prod. 2025 , 227 , 120846−120855..
Sotta, P.; Albouy, P. A.; Abou Taha, M.; Moreaux, B.; Fayolle, C. Crosslinked elastomers: structure-property relationships and stress-optical law. Polymers 2021 , 14 , 9..
Shen, J.; Lin, X.; Liu, J.; Li, X. Effects of cross-link density and distribution on static and dynamic properties of chemically cross-linked polymers. Macromolecules 2018 , 52 , 121−134..
Liu, C.; He, J.; Ruymbeke, E. V.; Keunings, R.; Bailly, C. Evaluation of different methods for the determination of the plateau modulus and the entanglement molecular weight. Polymer 2006 , 47 , 4461−4479..
Wu, K.; Wang, X. Transition of rheological responses to linear-nonlinear dichotomy: the role of polymers in particle-filled solutions. Macromolecules 2024 , 57 , 6593−6605..
Litvinov, V. M.; Orza, R. A.; Klüppel, M.; van Duin, M.; Magusin, P. C. M. M. Rubber–filler interactions and network structure in relation to stress–strain behavior of vulcanized, carbon black filled epdm. Macromolecules 2011 , 44 , 4887−4900..
Robertson, C. G.; Hardman, N. J. Nature of carbon black reinforcement of rubber: perspective on the original polymer nanocomposite. Polymers 2021 , 13 , 538..
Wei, Y.; Xie, W.; He, M.; Zhu, D.; Liu, S.; Zhang, L.; Liao, S. The role of non-rubber components acting as endogenous antioxidants on thermal-oxidative aging behavior of natural rubber. Polym. Test. 2022 , 111 , 107614..
Yang, W.; Zhou, W.; Zhang, Z. Structural and spectroscopic study on N -2-fluorobenzoyl- N ′-4-methoxyphenylthiourea. J. Mole. Struct. 2007 , 828 , 46−53..
Rolere, S.; Liengprayoon, S.; Vaysse, L.; Sainte-Beuve, J.; Bonfils, F. Investigating natural rubber composition with fourier transform infrared (FT-IR) spectroscopy: a rapid and non-destructive method to determine both protein and lipid contents simultaneously. Polym. Test. 2015 , 43 , 83−93..
Ikeda, Y.; Sakaki, Y.; Yasuda, Y.; Junkong, P.; Ohashi, T.; Miyaji, K.; Kobayashi, H. Roles of dinuclear bridging bidentate zinc/stearate complexes in sulfur cross-linking of isoprene rubber. Organometallics 2019 , 38 , 2363−2380..
[ŠKulteckĖ, J.; BitarytĖ, S.; Liubinas, K. FTIR-ATR spectroscopy to identify and quantify the SBS in modified bitumen. In 12th International Conference Environmental Engineering , Vilnius, Lithuania, 2023 , p. 1−6..
Smith, B. C. The infrared spectra of polymers. VI: Polymers with C-O bonds. Spectroscopy 2022 , 37 , 15−19, 27..
Hayeemasae, N.; Waesateh, K.; Soontaranon, S.; Masa, A. Effect of vulcanization systems and crosslink density on tensile properties and network structures of natural rubber. J. Technol. 2022 , 84 , 181−187..
Wei, Y.; Liu, G.; Zhang, L.; Zhao, F.; Liao, S.; Luo, M. Exploring the unique characteristics of natural rubber induced by coordination interaction between proteins and Zn 2+ . Polymer 2020 , 193 , 122357−122362..
Wang, M.; Wang, R.; Chen, X.; Kong, Y.; Huang, Y.; Lv, Y.; Li, G. Effect of non-rubber components on the crosslinking structure and thermo-oxidative degradation of natural rubber. Polym. Degrad. Stabil. 2022 , 196 , 109845−109855..
Nimpaiboon, A.; González-Jiménez, A.; Pérez-Aparicio, R.; Martín-Salamanca, F.; Zepeda-Rodríguez, Z.; López-Valentín, J.; Sakdapipanich, J. Effect of proteins on the network formation and degradation of peroxide cross-linked natural rubber elucidated by time-domain NMR. Polymers 2025 , 17 , 1063−1086..
[He, C. Z.; Peng, Z.; Zhong, J. P.; Liao, S. Q.; She, X. D.; Luo, Y. Y.; Tan, H. S. Thermal and thermo-oxidative degradations of deproteinized natural rubber and natural rubber. Adv. Mater. Res . 2011 , 306−307 , 50−57..
Omnès, B.; Thuillier, S.; Pilvin, P.; Grohens, Y.; Gillet, S. Effective properties of carbon black filled natural rubber: Experiments and modeling. Compos, A 2008 , 39 , 1141−1149..
Klüppel, M.; Schramm, J. A generalized tube model of rubber elasticity and stress softening of filler reinforced elastomer systems. Macromol. Theory Simul. 2000 , 9 , 742−754..
Song, Y.; Zheng, Q. Concepts and conflicts in nanoparticles reinforcement to polymers beyond hydrodynamics. Prog. Mater Sci. 2016 , 84 , 1−58..
Song, Y.; Zheng, Q. A guide for hydrodynamic reinforcement effect in nanoparticle-filled polymers. Crit. Rev. Solid State Mater. Sci. 2016 , 14 , 318−346..
Song, Y.; Wu, G.; Wang, D.; Peng, J.; Zhang, C.; Zheng, Q. Tailoring reinforcement and strain softening behaviors of natural rubber vulcanizates nanocomposites by dopamine-modified silica. Compos. B 2023 , 254 , 110552..
Roland, C. M. The mullins effect in crosslinked rubber. J. Rheol. 1989 , 33 , 659−670..
Diani, J.; Fayolle, B.; Gilormini, P. A review on the Mullins effect. Eur. Polym. J. 2009 , 45 , 601−612..
Harwood, J. A. C.; Mullins, L.; Payne, A. R. Stress softening in natural rubber vulcanizates. Part II. Stress softening effects in pure gum and filler loaded rubbers. J. Appl. Polym. Sci. 1965 , 9 , 814−822..
Harwood, J. A. C.; Payne, A. R. Stress softening in natural rubber vulcanizates. Part IV. Unfilled vulcanizates. J. Appl. Polym. Sci. 1966 , 10 , 1203−1211..
Han, J.; Wei, C.; Lu, A.; Song, K.; Zhang, Q.; Sun, G.; Xu, J.; Li, Z.; Liu, D. Visualizing filler network to reveal structural mechanisms on energy dissipation of mullins effect in silicone rubber. Polymer 2024 , 301 , 1−7..
Kittur, M. I.; Andriyana, A.; Ang, B. C.; Ch'ng, S. Y.; Verron, E. Inelastic response of thermo-oxidatively aged carbon black filled polychloroprene rubber. Part II: Mullins effect. Polym. Degrad. Stabil. 2022 , 204 , 110120..
Watson, W. F. Combination of rubber and carbon black on cold milling. Ind. Eng. Chem. 1955 , 47 , 1281−1286..
Leblanc, J. L. Rubber-filler interactions and rheological properties in filled compounds. Prog. Polym. Sci. 2002 , 27 , 627−687..
Kida, N.; Ito, M.; Yatsuyanagi, F.; Kaido, H. Studies on the structure and formation mechanism of carbon gel in the carbon black filled polyisoprene rubber composite. J. Appl. Polym. Sci. 1996 , 61 , 1345−1350..
Candau, N.; Chazeau, L.; Chenal, J.-M.; Gauthier, C.; Munch, E. Compared abilities of filled and unfilled natural rubbers to crystallize in a large strain rate domain. Compos. Sci. Technol. 2015 , 108 , 9−15..
Trabelsi, S.; Albouy, P. A.; Rault, J. Effective local deformation in stretched filled rubber. Macromolecules 2003 , 36 , 9093−9099..
Chen, L.; Wu, L.; Song, L.; Xia, Z.; Lin, Y.; Chen, W.; Li, L. The recovery of nano-sized carbon black filler structure and its contribution to stress recovery in rubber nanocomposites. Nanoscale 2020 , 12 , 24527−24542..
Trabelsi, S.; Albouy, P. A.; Rault, J. Crystallization and melting processes in vulcanized stretched natural rubber. Macromolecules 2003 , 36 , 7624−7639..
Le Cam, J. B. Energy storage due to strain-induced crystallization in natural rubber: the physical origin of the mechanical hysteresis. Polymer 2017 , 127 , 166−173..
Hou, F.; Song, Y.; Zheng, Q. Influence of liquid isoprene rubber on strain softening of carbon black filled isoprene rubber nanocomposites. Chinese J. Polym. Sci. 2021 , 39 , 887−895..
Hou, F.; Xia, Z.; Song, Y.; Chen, W.; Zheng, Q. Strain softening of bimodal isoprene rubber vulcanizates. Macromol. Mater. Eng. 2021 , 306 , 2000802..
Li, Z.; Wen, F.; Hussain, M.; Song, Y.; Zheng, Q. Scaling laws of mullins effect in nitrile butadiene rubber nanocomposites. Polymer 2020 , 193 , 122350..
Li, Z.; Xu, H.; Xia, X.; Song, Y.; Zheng, Q. Energy dissipation accompanying mullinseffect of nitrile butadiene rubber/carbon black nanocomposites. Polymer 2019 , 171 , 106−114..
Qi, X.; Wang, L.; Zhang, Y.; Jia, M.; Zhang, L.; Yue, D. Second natural rubber with self-reinforcing effect based on strain-induced crystallization. Macromolecules 2022 , 55 , 2758−2767..
0
浏览量
33
Downloads
0
CSCD
关联资源
相关文章
相关作者
相关机构
京公网安备11010802046900号