一种新型芳胺固化剂的性能研究

PROPERTIES OF A NOVEL AROMATIC DIAMINE CURING AGENT

以双酚A为原料,通过硝化和还原反应制备2,2-二(3-氨基-4-羟基)苯基丙烷化合物(HAPP)。以HAPP为固化剂,测定环氧树脂的凝胶特性,用DSC研究环氧树脂的固化反应,确定固化工艺条件,并用K issinger及Ozawa方法分别计算得到该体系固化反应的表观活化能为42.30kJ/mol和46.68kJ/mol,固化反应级数为0.86。研究结果表明,HAPP在固化环氧树脂时具有自催化作用,因而固化反应活化能较低。与间苯二胺顺丁烯二酸酐和二氨基二苯基甲烷固化剂相比,由于HAPP的苯环上带有羟基且为刚性的分子结构,既降低了固化温度,又提高了力学性能。HAPP固化环氧树脂/芳纶纤维复合材料的层间剪切强度为34.1MPa,弯曲强度为375MPa,拉伸强度为380MPa。

A novel diamine 2,2-bis （3-amido-4-hydroxy） phenyl-propane （HAPP） was prepared by nitrifying and reduction reactions of Bisphenol A. The curing behaviors of system composed of this new curing agent and epoxy resin was studied by means of the gel property of the system and differential scanning calorimeter （DSC）. The curing reaction activation energy of HAPP/Epoxy calculated by Kissinger and Ozawa methods were 42. 30 kJ/mol and 46. 68 kJ/mol respectively, and the cure reaction followed first-order kinetics. These results show that HAPP contai- ning hydroxyl and phenyl exerts an influence of autocatalysis on the curing system. HAPP is able to lower the activa- tion energy and curing temperature of the system. With HAPP as curing agent, the epoxy resin matrix composites reinforced with aramid fibre cloth exhibited excellent mechanical properties and their interlaminar shear strength, flex- ural strength and tensile strength are 34. 1MPa, 375MPa and 380MPa respectively.