几种胺类固化剂对环氧树脂固化行为及固化物性能的影响

固化剂结构对环氧树脂的固化行为和固化物性能具有重要影响,本文研究了聚醚胺(D-230)、异佛尔酮二胺(IPDA)和3,3'-二甲基-4,4'-二氨基-二环己基甲烷(DMDC) 3种胺类固化剂与实验室自制的低翻度环氧树脂A进行固化反应.通过薪度分析、红外(FTIR)光谱分析、DSC分析等手段研究了环氧树脂与固化剂反应程度...

Effect of amine curing agents on curing behavior of epoxy resin and properties of cured compounds

The structure of curing agents has an significant impact on curing behavior of epoxy resin and properties of cured compounds.Three amine curing agents, polyether amine(D230), alicyclic amine isophorone diamine(IPDA), 3,3′-dimethyl 4,4′-diamino dicyclohexyl methane(DMDC)were used for curing a self made low viscosity epoxy resin A.The curing process of the epoxy resin system cured with the curing agent under different curing times and curing temperatures were monitored by viscosity analysis, infrared(FTIR)spectroscopy, and differential scanning calorimetry analysis(DSC).The influence of curing temperature on tensile strength and elongation was investigated by universal testing machine.The results showed that curing reaction activation energy(Ea)of the three epoxy resin/hardener systems were 59.6 kJ·mol-1，50.9 kJ·mol-1 and 54.9 kJ·mol-1, respectively.Compared with aliphatic amine curing agent D230, the products cured with alicyclic curing agents IPDA and DMDC showed higher reaction activity and could result in higher degree of curing, higher tensile strength and greater elongation. Furthermore, curing agent DMDC with bicyclic structure could provide even more excellent toughness.