State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
zbning@mail.buct.edu.cn
收稿:2019-09-26,
修回:2019-11-12,
录用:2019-11-25,
网络首发:2019-12-30,
纸质出版:2020-06
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Wang, M.; You, L. C.; Guo, Y. Q.; Jiang, N.; Gan, Z. H.; Ning, Z. B. Enhanced crystallization rate of poly(L-lactide)/hydroxyapatite-graft-poly(D-lactide) composite with different processing temperatures. Chinese J. Polym. Sci. 2020, 38, 599–610
Min Wang, Lei-Chu You, Yu-Qi Guo, et al. Enhanced Crystallization Rate of Poly(L-lactide)/Hydroxyapatite-graft-poly(D-lactide) Composite with Different Processing Temperatures[J]. Chinese Journal of Polymer Science, 2020, 38(6): 599-610.
Wang, M.; You, L. C.; Guo, Y. Q.; Jiang, N.; Gan, Z. H.; Ning, Z. B. Enhanced crystallization rate of poly(L-lactide)/hydroxyapatite-graft-poly(D-lactide) composite with different processing temperatures. Chinese J. Polym. Sci. 2020, 38, 599–610 DOI: 10.1007/s10118-020-2374-1.
Min Wang, Lei-Chu You, Yu-Qi Guo, et al. Enhanced Crystallization Rate of Poly(L-lactide)/Hydroxyapatite-graft-poly(D-lactide) Composite with Different Processing Temperatures[J]. Chinese Journal of Polymer Science, 2020, 38(6): 599-610. DOI: 10.1007/s10118-020-2374-1.
Hydroxyapatite-graft-poly(D-lactide) (HA-
g
-PDLA) was synthesized by ring-opening polymerization with HA as initiator and stannous octanoate (Sn(Oct)
2
) as catalyst. Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) results indicate that PDLA chains are successfully grafted onto HA particles by covalent bond. Under two different processing temperatures (190 and 230 °C)
the effect of the grafted PDLA chains on the crystallization behavior of poly(L-lactide)/HA-
g
-PDLA (PLLA/HA-
g
-PDLA) composite was investigated in the current study
comparing to neat PLLA and its four composites (PLLA/HA
PLLA/HA-
g
-PLLA
PLLA/PDLA
and PLLA/HA/PDLA). The crystallization rate of PLLA/HA-
g
-PDLA composite is highly enhanced comparing to PLLA
PLLA/HA and PLLA/HA-
g
-PLLA composites in which there are no stereocomplex (SC) crystallites. In addition
when the processing temperature rises from 190 °C to 230 °C
the acceleration of PLLA crystallization in PLLA/HA-
g
-PDLA composite is not influenced so much as other composites containing SC crystallites
such as PLLA/HA/PDLA or PLLA/PDLA. The differential scanning calorimetry (DSC) results demonstrate that even without SC crystallites
the crystallization of PLLA can still be accelerated a lot in this composite. This may be related to the interaction between the grafted PDLA chains and the amorphous PLLA chains in PLLA/HA-
g
-PDLA composite. The isothermal crystallization kinetics studies indicate that the nature of nucleation and crystal growth of PLLA/HA-
g
-PDLA composite are more likely 3D crystalline growth with heterogeneous nucleation mode
which are different from PLLA or other composites. This investigation could shed new light on the application of PLLA/HA composites.
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