点击次数：

论文类型：期刊论文

发表时间：2017-06-01

发表刊物：EUROPEAN POLYMER JOURNAL

收录刊物：SCIE、EI

卷号：91

页面范围：376-385

ISSN号：0014-3057

关键字：Poly(lactic acid); Crystallization; Memory effect; FTIR

摘要：The influence of crystalline memory effect on poly(lactic acid) (PLA) crystallization was probed by time-resolved Fourier transform infrared spectroscopy (FTIR). The melt with different degrees of order was prepared by melting at various temperatures. The vibrational changes associated with inter- and intra-chain interactions during crystallization were monitored. In the initial period of crystallization, the order of intensity changes is as follows: 1458 cm(-1) > 1210 cm(-1) >> 921 cm(-1), 1458 cm(-1) > 1210 cm(-1) > 921 cm(-1), and 1458 cm(-1) > 1210 cm(-1)- 921 cm(-1) for PLA melted at 190, 170, and 168 C, respectively. With increasing the degree of order, both the formation of skeletal conformational-ordered structure and, especially, the 103 helix structure are accelerated. The influence of memory effect on the crystallization kinetics was also discussed based on the Avrami model.