环氧树脂复合材料树脂-固化剂力学性能研究

Study on the mechanical property of resin-curing agent in EP composite

环氧树脂作为树脂矿物复合材料(RMC)中的粘结剂,其固化特性将直接影响RMC的整体性能。环氧树脂固化物的力学性能主要取决于体系中的交联密度。通过分析不同配比下固化物的固化特性和交联密度,结合力学性能的测试及断口形貌的观察,探究交联密度与力学性能之间的联系,获得环氧树脂与固化剂的最佳配比。研究结果表明,固化剂过量或不足均会引起固化不完全及交联密度下降,从而导致力学性能减弱,固化物拉伸断裂时内部交联点间界面发生断裂形成齐平光滑的断口。环氧树脂与固化剂比例为3.3∶1时,固化特性良好,形成均匀致密的固化物,拉伸断裂时内部交联点发生断裂形成鳞块状断口,固化物拥有极佳的交联密度与力学性能。

Epoxy resin(EP)is used as binder in resin mineral composite(RMC),and its curing characteristics will directly affect the overall performance of RMC.The mechanical properties of the cured EP mainly depend on the crosslinking density in the system.By analyzing the curing characteristics and crosslinking density of the over-cured material in different proportions,combining the test of mechanical properties and the observation of the fracture morphology,the relationship between the crosslinking density and the mechanical properties was explored,and obtained the best ratio of EP and curing agent.The research results shown that excessive or insufficient curing agent will cause incomplete curing and decrease of crosslinking density,resulting in weakening of mechanical properties.When the cured product was stretched and fractured,the interface between the internal crosslinking points will break to form a smooth fracture.When the ratio of EP to curing agent was 3.3∶1,the curing characteristics were good to form uniform and dense cured product.During tensile fracture,the internal crosslinking points will break to form a scaly fracture.The cured product had excellent crosslinking density and mechanical properties at this ratio.