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Preparation and performance of selfhealing epoxy resin composite with healing agent modified by melt reaction |
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Poly(bisphenol Acoepichlorohydrin) glycidyl endcapped(BPAcoECH GEC) was modified by melt reaction with 3phenylpropionic acid to prepare selfhealing epoxy resin composite. The results show that epoxy end groups can be reacted with 3phenylpropionic acid. The healing efficiency is markedly improved by the increasing of healing agent content. The healing efficiency reaches 34.5% with 10% healing agent at 120 ℃ for 6 h. The enhancement of healing efficiency from 3 h to 6 h is obviously more than that from 6 h to 9 h for every sample with different healing agent content. The molecular motion of healing agent molecular chain reaches new equilibrium for the healing time of 6 h. The healing efficiency is increased by increasing healing temperature. The whole healing agent molecular chains motion at healing temperature range of 120 to 130 ℃.Multitime rehealing efficiency is decreased with the increasing of healing time. The healing effect of samples without healing agent is due to the resolidification of epoxy resin. The downtrend of multitime rehealing efficiency is markedly decreased by adding healing agent.
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