Greatly accelerated crystallization of poly(lactic acid): cooperative effect of stereocomplex crystallites and polyethylene glycol

被引：39

作者：

Wei, Xin-Feng ^{[1
]}

Bao, Rui-Ying ^{[1
]}

Cao, Zhi-Qiang ^{[1
]}

Zhang, Liang-Qing ^{[1
]}

Liu, Zheng-Ying ^{[1
]}

Yang, Wei ^{[1
]}

Xie, Bang-Hu ^{[1
]}

Yang, Ming-Bo ^{[1
]}

机构：

[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn, Chengdu 610065, Sichuan, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 2014年 / 292卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Poly(lactic acid); Crystallization; Stereocomplex; POLY(L-LACTIC ACID); MECHANICAL-PROPERTIES; MOLECULAR-WEIGHT; POLY(D-LACTIC ACID); BEHAVIOR; POLYLACTIDE; MORPHOLOGY; MELT; GROWTH; PLASTICIZATION;

D O I：

10.1007/s00396-013-3067-x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Stereocomplex crystallite (SC) between enantiomeric poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA), with largely improved thermal resistance and mechanical properties compared with PLLA and PDLA, is a good nucleating agent for poly(lactic acid) (PLA). The effects of SC and/or polyethylene glycol (PEG) on the crystallization behaviors of PLA were investigated. The non-isothermal and isothermal crystallization kinetics revealed that SC and PEG can separately promote the crystallization rate of PLA by heterogeneous nucleation and increasing crystal growth rate, respectively. However, their promoting effect is limited when used alone, and the modified PLA cannot crystallize completely under a cooling rate of 20 A degrees C/min. When SC and PEG are both present, the crystallization rate of PLA is greatly accelerated, and even under a cooling rate of 40 A degrees C/min, PLA can crystallize completely and get a high crystallinity owing to the excellent balance between simultaneously improved nucleation and crystal growth rate.

引用

页码：163 / 172

页数：10

共 46 条

[1] Sterilization, toxicity, biocompatibility and clinical applications of polylactic acid polyglycolic acid copolymers [J].