Self-organized thermosets involving epoxy and poly(ε-caprolactone)-block-poly(ethylene-co-ethylethylene)-block-poly(ε-caprolactone) amphiphilic triblock copolymer
Self-organized thermosets involving epoxy and poly(ε-caprolactone)-block-poly(ethylene-co-ethylethylene)-block-poly(ε-caprolactone) amphiphilic triblock copolymer
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DOI：
10.1016/j.polymer.2010.10.016
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发表时间：
2010-11-26
期刊：
影响因子：
4.6
通讯作者：
Zheng, Sixun
中科院分区：
文献类型：
--
作者：
Hu, Di;Zhang, Chongyin;Zheng, Sixun
在这项工作中，我们研究了聚（ε-己内酯）-嵌段-聚（乙烯-共-乙基乙烯）-嵌段-聚（ε-己内酯）（PCL-b-PEEE-b-PCL）三嵌段共聚物在环氧热固性材料中的自组装行为。以端羟基聚(乙烯-乙基乙烯)为大分子引发剂，通过ε-己内酯的开环聚合合成了PCL-b-PEEE-b-PCL三嵌段共聚物。端羟基聚(乙烯-共-乙基乙烯)是通过端羟基聚丁二烯的加氢反应制备的。将三嵌段共聚物掺入环氧树脂前体中以获得纳米结构热固性材料。研究发现，在固化反应之前，混合物中形成了自组织纳米相，并且纳米结构可以通过固化反应进一步固定。通过原子力显微镜（AFM）、小角X射线散射（SAXS）和动态机械热分析（DMTA）研究了三嵌段共聚物在环氧热固性材料中的自组装行为。差示扫描量热法(DSC)表明，热固性材料中自组织纳米相的形成导致部分聚ε-己内酯子链从环氧基体中分层，并发生固化反应；根据环氧树脂和 PCL 模型二元共混物的 T-g 组成关系估算分层 PCL 嵌段的分数。 (C) 2010 Elsevier Ltd. 保留所有权利。
In this work, we investigated the self-assembly behavior of poly(epsilon-caprolactone)-block-poly(ethylene-co-ethylethylene)-block-poly(epsilon-caprolactone) (PCL-b-PEEE-b-PCL) triblock copolymer in epoxy thermosets. The PCL-b-PEEE-b-PCL triblock copolymer was synthesized via the ring-opening polymerization of epsilon-caprolactone with a hydroxyl-terminated poly(ethylene-co-ethylethylene) as the macromolecular initiator. The hydroxyl-terminated poly(ethylene-co-ethylethylene) was prepared with the hydrogenation reaction of a hydroxyl-terminated polybutadiene. The triblock copolymer was incorporated into the precursors of epoxy to obtain the nanostructured thermosets. It was found that the self-organized nanophases were formed in the mixture before curing reaction and the nanostructures can be further fixed via curing reaction. The self-assembly behavior of the triblock copolymer in epoxy thermosets was investigated by means of atomic force microscopy (AFM), small-angle X-ray scattering (SAXS) and dynamic mechanical thermal analysis (DMTA). Differential scanning calorimetry (DSC) shows that the formation of the self-organized nanophase in the thermosets caused that a part of poly(epsilon-caprolactone) subchains were demixed from epoxy matrix with the occurrence of curing reaction; the fractions of demixed PCL blocks were estimated according to the T-g-composition relation of the model binary blends of epoxy and PCL. (C) 2010 Elsevier Ltd. All rights reserved.