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论文类型：期刊论文

发表时间：2015-05-01

发表刊物：POLYMER TESTING

收录刊物：SCIE、EI

卷号：43

页面范围：103-107

ISSN号：0142-9418

关键字：Poly(lactic acid); Orientation; Relaxation

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.