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Citation: CHENG Hai-Bo, CHEN Xue-Si, XIAO Hai-Hu, HU Xiu-Li, JING Xia-Bin. Promotion of Crystallization in Linear Polylactide by Multiarm-polylactide[J]. Chinese Journal of Applied Chemistry, ;2010, 27(7): 754-758. doi: 10.3724/SP.J.1095.2010.90720 shu

Promotion of Crystallization in Linear Polylactide by Multiarm-polylactide

a. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
b. Graduate School of Chinese Academy of Sciences, Beijing

Received Date: 3 November 2009
Revised Date: 6 January 2010

Multi-arm polylactide (MA-PLA) was melt-blended with commercial polylactide (PLLA) to improve its crystallinity. MA-PLA was prepared by the ring-opening polymerization of L-lactide using multihydroxy-terminated polyester as initiator. The DSC curve during the 2nd heating shows an apparent cold crystallization peak(41.5 J/g) and a melting peak(42.5 J/g) for MA-PLA,which could not be observed for commercial PLLA 3051D and indicated a better crystallinity of MA-PLA than that of 3051D. The L-lactic acid unit content in MA-PLA was 97% and was higher than that in 3051D (91%). After blending with 6% MA-PLA,the blend showed an obvious cold crystallization peak and a melting peak. Polarized optical microscopy(POM) observation revealed a faster nucleation rate and an early-stage spherulite growth rate in the blend than those in neat 3051D. The isothermal crystallization gave a half crystallization time of 53.6 min for neat 3051D and 31.7 min for the blend. In addition,the Avrami indexes(n) are 2.25 and 2.60 for 3051D and the blend,respectively. The improvement in crystallinity was ascribed to the heterophase nucleation effect caused by the multi-arm polylactide.
- multi-arm polylactide,
- crystallization,
- spherulites,
- nucleation
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Promotion of Crystallization in Linear Polylactide by Multiarm-polylactide

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com