Abstract Curing of epoxy resins with aromatic amines, which provides an excellent combination of physical and mechanical properties, requires high temperatures. In this research, the amidoamine adduct of tall oil with triethylenetetramine have been used for acceleration of the reaction of the aromatic amine (diaminodiphenyl sulfone, DDS) with the diglycidyl ether of bisphenol A (DGEBA) epoxy resin. The kinetics of the curing reaction of DGEBA with a mixture of two hardeners was investigated by the non-isothermal DSC method. It was shown that the activation energy of curing decreased from ~ 68 to ~ 59 kJ/mole at amidoamine introduction. Nevertheless, there were no new bands in the IR-spectra of the cured epoxy resins. The acceleration of the curing reaction of the aromatic amine was apparently due to the autocatalytic action of the hydroxyl groups formed by the reaction of the epoxy resin with the amidoamine. Besides acceleration of curing, use of the hardener mixture significantly increased the rubbery-plateau modulus, while not influencing on the value of the elasticity modulus of the cured resin in the glassy state. A disadvantage of using amidoamine for accelerating the curing was lowering of the glass transition temperature of the cured polymer. Graphical abstract

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使用脂肪胺和芳香胺的组合加速环氧树脂固化

摘要 环氧树脂与芳香胺的固化需要高温才能提供优异的物理和机械性能组合。在本研究中，妥尔油与三亚乙基四胺的酰氨基胺加合物已被用于加速芳香胺（二氨基二苯砜，DDS）与双酚A（DGEBA）环氧树脂的二缩水甘油醚的反应。通过非等温 DSC 方法研究了 DGEBA 与两种固化剂混合物的固化反应动力学。结果表明，在引入酰氨基胺时，固化活化能从~68 kJ/mole 降低到~59 kJ/mole。尽管如此，固化环氧树脂的红外光谱中没有新的谱带。芳香胺固化反应的加速显然是由于环氧树脂与酰胺胺反应形成的羟基的自催化作用。除了加速固化外，固化剂混合物的使用显着增加了橡胶平台模量，同时不影响玻璃态固化树脂的弹性模量值。使用酰氨基胺加速固化的缺点是固化聚合物的玻璃化转变温度降低。图形概要 使用酰氨基胺加速固化的缺点是固化聚合物的玻璃化转变温度降低。图形概要 使用酰氨基胺加速固化的缺点是固化聚合物的玻璃化转变温度降低。图形概要