Stabilization of poly(lactic acid) by polycarbodiimide

被引：65
|
作者：
Yang, Lixin [1 ,2 ]
Chen, Xuesi [1 ]
Jing, Xiabin [1 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
来源：
POLYMER DEGRADATION AND STABILITY | 2008年 / 93卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Poly(L-lactic acid); Polycarbodiimide; Thermostability; Thermal degradation; Hydrolysis;
D O I：
10.1016/j.polymdegradstab.2008.06.016
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Polycarbodiimide (CDI) was used to improve the thermal stability of poly(L-lactic acid) (PLA) during processing. The properties of PLA containing various amounts of CDI were characterized by GPC, DSC, rheology, and tensile tests. The results showed that an addition of CDI in an amount of 0.1-0.7 wt% with respect to PLA led to stabilization of PLA at even 210 degrees C for up to 30 min, as evidenced by much smaller changes in molecular weight. melt viscosity, and tensile strength and elongation compared to the blank PLA samples. In order to examine the possible stabilization mechanism, CDI was reacted with water, acetic acid, L-lactic acid, ethanol and low molecular weight PLA. The molecular structures of the reaction products were measured with FTIR. The results showed that CDI could react with the residual or newly formed moisture and lactic acid, or carboxyl and hydroxyl end groups in the PLA samples, and thus hamper the thermal degradation and hydrolysis of PLA. (C) 2008 Elsevier Ltd. All rights reserved
引用
收藏
页码：1923 / 1929
页数：7
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