聚酰胺与乙二醇二缩水甘油醚对环氧树脂体系力学性能和阻尼性能的影响

EFFECT OF POLYAMIDE AND ETHYLENE DIGLYCIDYL ETHER ON MECHANICAL PROPERTIES AND DAMPING PROPERTIES OF EPOXY RESIN SYSTEM

为了设计出具备一定力学强度,施工性能良好、阻尼内耗较高的环氧树脂体系,首先研究了低分子固化剂聚酰胺含量对环氧树脂交联密度,力学性能以及阻尼性能的影响,然后添加活性稀释剂乙二醇二缩水甘油醚,探讨了乙二醇二缩水甘油醚对环氧树脂体系粘度、力学和阻尼性能的影响,并分析了交联密度对树脂性能的影响规律。研究表明,随着聚酰胺和活性稀释剂含量的增加,树脂固化物交联度减小,抗压强度和拉伸强度下降,断裂伸长率升高,T_g向低温转移。聚酰胺与环氧树脂配比在1∶1时,阻尼损耗峰值最大。随着活性稀释剂含量的增加,环氧体系损耗峰先升高后降低,在含量为20%时,阻尼性能达到最佳。

In order to design an epoxy resin system with certain mechanical strength,good construction performance and high damping internal friction,the effect of content of low molecular weight agent polyamide on the cross-linking degree,mechanical properties and damping property of epoxy resin was studied.Then,by adding ethylene diglycidyl ether,the effects of ethylene diglycidyl ether on the viscosity,mechanical properties and damping properties of epoxy resin were discussed,and the effect of cross-linking degree on the properties of resin was analyzed.The results show that the cross-linking degree decreases,the compression strength and tensile strength decrease,and the elongation at break increases and the Tgtransfers to low temperature with the increase of the content of polyamide or active diluent.When the ratio of polyamide to epoxy resin is 1 ∶1,damping loss factor is the highest.With the increase of the content of active diluent,the loss factor of epoxy system increased firstly and then decreased,and the damping performance was the best when the content was 20%.