Effect of the molecular weight of poly(vinyl acetate) on the polymorphism and thermomechanical properties of poly(L-lactic acid)/poly(D-lactic acid) blends

被引：0
作者：
Yi Li
Lijia Zhao
Changyu Han
Liguang Xiao
Yancun Yu
Guangbin Zhou
Mingzhi Xu
机构：
[1] Jilin Jianzhu University,School of Materials Science and Engineering
[2] Chinese Academy of Sciences,Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry
来源：
Journal of Thermal Analysis and Calorimetry | 2022年 / 147卷
关键词：
Poly(vinyl acetate); Poly(lactic acid); Molecular weight; Stereocomplexation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The effects of molecular weight (Mw) and content of poly(vinyl acetate) (PVAc) on the crystallization behaviors, competing crystallization of homocrystallites and stereocomplex crystallites (SCs), crystalline structure, and mechanical properties of poly(L-lactic acid) (PLLA)/poly(D-lactic acid) (PDLA) blends were investigated. The crystallization of PLLA/PDLA component is accelerated after the addition of low-Mw PVAc and is suppressed with high-Mw PVAc. The ability of SC formation is enhanced via blending with PVAc, irrespective of its Mw, and becomes prominent with low-Mw PVAc. The exclusive SCs are obtained in the blends with 30 mass % low-Mw PVAc. The improvement in thermomechanical property above 170 °C is ascribed to the enhancement of SC content. This work presents guidance for achieving the melt processability of SC-PLA, thus proving their potential as a high-performance substitute for conventional plastics.
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页码：3171 / 3184
页数：13
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