环氧树脂交联结构对固化动力学的影响

The effect of cross-linked structure of epoxy resin on curing kinetics

在环氧树脂E54中引入不同比例的三官能团间氨基苯酚环氧树脂S500M进行物理共混,采用DDS固化剂,制备不同交联结构的环氧树脂。利用非等温DSC法对环氧树脂固化过程进行分析,根据固化反应热绘制固化度与温度曲线,通过Kissinger和Crane方程计算树脂固化反应活化能和动力学参数。结果表明,随着树脂交联密度的提高,固化反应的开始温度、峰值温度、终止温度均发生前移,固化时间缩短,固化反应活化能降低,但频率因子和反应级数基本不变。

The epoxy resin E54 was added with different proportions of the trifunctional meta-aminophenol epoxy resin S500M and was used to prepare the epoxy resins which has different cross-linked structures with the DDS curing agent.The non-isothermal DSC method was used to analyze the curing process of epoxy resin,and the curing degree versus temperature curve was drawn according to the curing reaction heat.The activation energy and kinetic parameters of the epoxy resin systems were obtained by using Kissinger and Crane equations.With the increase of crosslinking density,the results showed that the starting temperature,peak temperature and termination temperature of the curing reaction moved forward,the curing time was shortened,and the activation energy of curing reaction was decreased,but the frequency factor and reaction order were basically unchanged.