Melt stereocomplexation from poly(L-lactic acid) and poly(D-lactic acid) with different optical purity
Melt stereocomplexation from poly(L-lactic acid) and poly(D-lactic acid) with different optical purity
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不同光学纯度的聚（L-乳酸）和聚（D-乳酸）的熔融立体络合
DOI：
10.1016/j.polymdegradstab.2012.12.024
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发表时间：
2013-04-01
影响因子：
5.9
通讯作者：
Chen, Xuesi
中科院分区：
文献类型：
--
作者：
Liu, Yanlong;Sun, Jingru;Chen, Xuesi
将不同光学纯度的聚L-乳酸（PLLA）和聚D-乳酸（PDLA）在密炼机中共混，研究了它们的结晶行为。在特定的条件下，PLLA和PDLA之间可以得到几乎完整的立体复合物微晶。立体复合物的熔融温度与PLLA和PDLA的光学纯度有关，也与混合温度和时间有关。当混合温度比纯PLLA和PDLA（质量比1：1）的熔融温度高几十度时，可以在短时间内形成立体复合物，并且在一些样品中没有发现均聚或微量均聚，本文提出了立体复合物形成的可能机理，并认为剪切力在熔融混合过程中起重要作用。皇冠版权所有（C）2013由爱思唯尔有限公司出版。保留所有权利。
Poly(L-lactic acid) (PLLA) and Poly(D-lactic acid) (PDLA) with different optical purity were blended in an internal mixer and their crystallization behavior were investigated. Nearly complete stereocomplex crystallites could be obtained at specific condition between PLLA and PDLA. The melting temperature of stereocomplex was related with the optical purity of PLLA and PDLA, and also with the mixing temperature and time. When the mixing temperature was set dozens of degrees above the melting temperature of pure PLLA and PDLA at a weight ratio 1:1, the stereocomplex could be formed within a short period of time, and no homocrystallization or trace homocrystallization in some samples could be found. The possible mechanism of stereocomplex formation was achieved in this article and the shear force play an important role during the melt mixing process. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.