微胶囊对环氧树脂体系性能影响的研究

采用原位聚合法以脲醛树脂为壁材,E-51环氧树脂为芯材制备了微胶囊并将其加人E-51环氧树脂/1622T改性脂肪胺体系中。采用示差扫描量热法及力学性能测试研究了该体系的固化动力学及其他性能。结果表明:微胶囊质量分数为10%时,体系的凝胶温度、固化温度和后处理温度均降低,固化度提高。活化能达到极小值45.02kJ/mol,较纯环氧体系降低18.91%。冲击强度达到极大值2.58kJ/m^2,较纯环氧树脂体系提高20.34%。微胶囊质量分数为5%时,拉伸强度和弯曲强度分别为67.1MPa和86.2MPa,较纯环氧树脂体系分别提高6.5%和10.51%。

Effects of microcapsules on the properties of epoxy resin systems

The inicrocapsules were prepared by in-situ polymerization using urea-formaldehyde resin as the wall material and E-51 epoxy resin as the core material and added to the E-51 epoxy resin/1622T modified fatty amine system.The curing kinetics and other properties of the systems were investigated by differential scanning calorimetry and mechanical property testings.The results showed that when the microcapsule mass fraction was 10%,the gelation temperature,curing temperature and post-treatment temperature of the systems were decreased,and the curing degree was increased.The activation energy reached a minimum value of 45.02 kj/mol,which was 18.91%lower than that of the pure epoxy system.The impact strength reached a maximum value of 2.58 kj/m^2,which was 20.34%higher than that of the pure epoxy system.When the microcapsule mass fraction was 5%,the tensile strength and flexural strength were 67.1 MPa and 86.2 MPa,respectively,which were 6.5%and 10.51%higher than those of the pure epoxy system.