Spectroscopic analysis of post drawing relaxation in poly(lactic acid) with oriented mesophase

被引：22

作者：

Wang, Yaming ^{[1
]}

Liu, Lulu ^{[1
]}

Li, Ming ^{[1
]}

Cao, Wei ^{[1
]}

Liu, Chuntai ^{[1
]}

Shen, Changyu ^{[1
,2
]}

机构：

[1] Zhengzhou Univ, Natl Engn Res Ctr Adv Polymer Proc Technol, Key Lab Adv Mat Proc & Mold, Minist Educ, Zhengzhou 450002, Peoples R China

[2] Dalian Univ Technol, Dept Engn Mech, Dalian 116024, Peoples R China

来源：

POLYMER TESTING | 2015年 / 43卷

基金：

中国国家自然科学基金;

关键词：

Poly(lactic acid); Orientation; Relaxation; POLY(L-LACTIC ACID); CRYSTALLIZATION KINETICS; DIMENSIONAL STABILITY; INFRARED-SPECTROSCOPY; STRAIN; FILMS; CRYSTALLINITY; DEFORMATION; POLYLACTIDE; MORPHOLOGY;

D O I：

10.1016/j.polymertesting.2015.03.001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Uniaxial deformation of amorphous poly(lactic acid) (PLA) film was performed at 60 degrees C (around the glass transition temperature). The deformed samples revealed a strain-induced mesophase, and its fraction and thermal stability increased with draw strain. Further annealing was performed in situ at constant length, at the drawing temperature for the films drawn to strains of 100% and 230%. Interestingly, the orientation of amorphous phase relaxed more rapidly for the 100% sample compared with the 230% one. This could be ascribed to the constraint effect of mesophase on the amorphous chains. In addition, the chains of mesophase relaxed slightly for the 100% sample while it retained high orientation for the 230% sample. Meanwhile, the mesophase fraction decreased, and the trend was more significant for the sample drawn to 100%. These effects can be ascribed to the melting of mesophase and the different thermal stabilities of the mesophases. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：103 / 107

页数：5

共 25 条

[1]

Alexander L.E., 1969, X-ray Diffraction Methods in Polymer Science, P137

[2] Morphological study on thermal shrinkage and dimensional stability associated with oriented poly(lactic acid) [J].