共聚物
高分子化学
乙二醇
材料科学
熔点
丙交酯
化学工程
聚合物
PEG比率
环氧乙烷
胶束
聚合
化学
有机化学
复合材料
经济
财务
作者
Choi Jaeyeong,Hiroharu Ajiro
出处
期刊:Polymer Journal
[Springer Nature]
日期:2021-10-14
卷期号:54 (2): 151-160
被引量:1
标识
DOI:10.1038/s41428-021-00564-1
摘要
Polylactide (PLA) stereocomplexes (SCs) formed by poly(L,L-lactide) (PLLA) and poly(D,D-lactide) (PDLA) are well known, and their derivatives and copolymers have also been reported. However, little research has been conducted on SCs with a combination of one enantiomer of a copolymer and a homopolymer. In this study, we selected a PLA copolymer with poly(ethylene glycol) (PEG) and a urethane capping PLA bearing almost the same molecular weights as PLA segments and prepared various SC samples. Depending on the combination of L-isomers and D-isomers, the SCs were classified as a Homo-SC, Co-SC, and Multi-SC: the Homo-SC had the same polymer chain ends and copolymers, the Co-SC had different polymer chain ends and copolymers, and the Multi-SC had a mixture of various polymer chain ends and copolymers. Depending on the chain end structures, the melting points of the SCs changed in the case of Homo-SC and Co-SC, but Multi-SC showed two broad melting points at ~200 °C. We propose that these findings are the results of the various combinations of polymer–polymer interactions in the case of Multi-SC.
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