Exploring the Application of Sustainable Poly(propylene carbonate) Copolymer in Toughening Epoxy Thermosets
Exploring the Application of Sustainable Poly(propylene carbonate) Copolymer in Toughening Epoxy Thermosets
复制标题
探索可持续聚（碳酸亚丙酯）共聚物在增韧环氧热固性材料中的应用
DOI：
10.1021/acssuschemeng.5b00343
复制
发表时间：
2015-09-01
影响因子：
8.4
通讯作者：
Feng, Jiachun
中科院分区：
文献类型：
--
作者：
Chen, Shusheng;Chen, Bin;Feng, Jiachun
本文以聚碳酸亚丙酯（PPC）为引发剂进行ε-己内酯聚合，制备了聚ε-己内酯-聚碳酸亚丙酯-嵌段-聚ε-己内酯（PCL-PPC-PCL）三嵌段共聚物，实现了PPC作为环氧热固性树脂增韧剂的创新应用。PPC改性剂与环氧树脂基体之间的界面相互作用显着增强，因为PCL嵌段与环氧树脂基体是互溶的。当两亲嵌段共聚物在环氧树脂中形成纳米相时，分散的PPC改性剂的尺寸急剧减小。因此，与纯环氧树脂相比，将30重量%的PCL-PPC-PCL改性剂掺入热固性树脂中，拉伸伸长率和应力-应变曲线下的面积分别增加了320%和180%以上，表明使用这种策略实现了优异的增韧效果。考虑到PPC具有众多诱人的性能，但在实际应用中存在玻璃化转变温度低的问题。
Herein, poly(propylene carbonate) (PPC) was used as initiator for e-caprolactone polymerization to produce the poly(e-caprolactone)-block-poly(propylene carbonate)-block-poly(e-caprolactone) (PCL-PPC-PCL) triblock copolymer, enabling innovative application of PPC as a toughening agent of epoxy thermosets. The interfacial interaction between PPC modifiers and epoxy was enhanced significantly because PCL blocks were miscible with epoxy matrix. The size of separated PPC modifiers decreased dramatically as the amphiphilic block copolymer formed nanophases in epoxy host. Consequently, with the incorporation of 30 wt % PCL-PPC-PCL modifier into the thermoset, the tensile elongation and the area under the stress–strain curves increased by more than 320% and 180%, respectively, compared with neat epoxy, indicating that an excellent toughening effect was achieved using this strategy. Considering that PPC possessed an ocean of attractive properties but suffered from its low glass transition temperature in implement...