文献类型：期刊文献

英文题名：Interfacial toughening and consequent improvement in fracture toughness of carbon fiber reinforced epoxy resin composites: induced by diblock copolymers

作者：Deng, S. H.[1];Zhou, X. D.[1];Zhu, M. Q.[2];Fan, C. J.[1];Lin, Q. F.[2]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：7

期号：11

起止页码：925

外文期刊名：EXPRESS POLYMER LETTERS

收录：;EI(收录号：20133716726125);WOS:【SCI-EXPANDED(收录号:WOS:000324169600006)】；

基金：The authors sincerely acknowledge the support of NSFC 51073055 and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：polymer composites; diblock copolymer; interface; fracture toughness; DMA

摘要：Carbon fibers chemically grafted with hydroxyl-terminated diblock copolymer poly (n-butylacrylate)-b-poly (glycidyl methacrylate) (OH-PnBA-b-PGMA), were used as the reinforcement for epoxy composites. The multi-filament composite specimens were prepared and measured by dynamic mechanical analysis (DMA), to study the interfacial toughness of carbon fiber reinforced epoxy composites with the diblock copolymers. The loss modulus and loss factor peaks of beta-relaxation indicated that composites with diblock copolymers could dissipate more energy at small strain and possess better interfacial toughness, whereas composites without the ductile block PnBA having the worse interfacial toughness. The glass transition temperature and the apparent activation energy calculated from the glass transition showed that the strong interfacial adhesion existed in the composites with diblock copolymers, corresponding with the value of interfacial shear strength. Therefore, a strengthening and toughening interfacial structure in carbon fiber/epoxy composites was achieved by introducing the diblock copolymer OH-PnBA-b-PGMA. The resulting impact toughness, characterized with an Izod impact tester, was better than that of composite without the ductile block PnBA.