Memory effect on the crystallization behavior of poly(lactic acid) probed by infrared spectroscopy
Memory effect on the crystallization behavior of poly(lactic acid) probed by infrared spectroscopy
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红外光谱探讨聚乳酸结晶行为的记忆效应
DOI：
10.1016/j.eurpolymj.2017.04.016
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发表时间：
2017-06
影响因子：
6
通讯作者：
Shen Changyu
中科院分区：
文献类型：
--
作者：
Zhang Huanhuan;Shao Chunguang;Kong Weili;Wang Yaming;Cao Wei;Liu Chuntai;Shen Changyu
采用时间分辨傅里叶变换红外光谱（FTIR）研究了晶体记忆效应对聚乳酸（PLA）结晶的影响。通过在不同温度下熔融，制备了不同有序度的熔体。对结晶过程中与链间和链内相互作用相关的振动变化进行了监测。在结晶初期，PLA的结晶强度变化顺序为：1458 cm−1> 1210 cm−1 ~ 921 cm−1,1458 cm−1> 1210 cm−1> 921 cm−1,1458 cm−1> 1210 cm−1 ~ 921 cm−1。随着有序度的增加，骨架构象有序结构的形成速度加快，尤其是103螺旋结构的形成速度加快。基于Avrami模型，讨论了记忆效应对结晶动力学的影响。
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−1for 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 103helix structure are accelerated. The influence of memory effect on the crystallization kinetics was also discussed based on the Avrami model.
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影响因子：
8.4
作者：
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DOI：
10.1002/polb.24051
发表时间：
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期刊：
Journal of Polymer Science Part B
影响因子：
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