环氧网络结构设计与复合材料增韧的研究

STUDY ON THE DESIGNING OF EPOXY NETWORK STRUCTURE AND THE TOUGHENING OF COMPOSITE LAMINATES

本文以自由体积理论，对ＢＦ_３ＭＥＡ固化环氧网络结构与Ｔ_ｇ的关系进行了研究，并分析了组分对网络Ｔ_ｇ的贡献，为确定固化剂的影响，对ＢＦ_３ＭＥＡ及ＤＤＳ固化环氧网络的断裂韧性进行了测试。结果表明，ＤＤＳ固化体系的韧性要比ＢＦ_３ＭＥＡ固化的相应的环氧网络的高。根据理论分析及实验结果，对复合材料基体的网络结构进行了重新设计，在提高复合材料层间韧性的同时保证其耐热性不会下降。实验结果验证了这一设想。

Based on the free volume theory and the experimental results,the contributions of the components to T_g of the network were analysed. To determine the effect of curing agent,the fracture toughness of epoxy network , cured by DDS was investigated. The experimental results showed that K_(IC) of epoxy network cured by DDS was much tougher than the corresponding network cured by BF_3MEA. According to the above analysis,the network of matrix was deliberately designed, in order to improve the interlaminar toughness of composite without the degradation of its high temperature performance,and the feasibility of this method was confirmed by the experimental data.