Abstract The cure kinetics of thermosetting polyurethane/epoxy composites based on oligomeric diglycidyl ether of bisphenol A and branched oligomeric diphenylmetane diisocyanate and polymeric aliphatic amine or mixture of low molecular weight aromatic amines as hardener was studied. It was shown that curing process comprises three stages: at first, a polyurethane network is formed, after that amine hardener react with epoxy oxirane rings with formation linear oligomers, and at the final stage of curing, the network is formed by reaction of secondary amines obtained on the second stage with epoxy oxirane rings. The isoconversional methods of Flynn–Wall–Ozawa and Kissinger-Akahira-Sunose were employed to investigate activation energy as a function of curing degree. The correlation between Ea and α determined by these methods indicated that there were autocatalytic effects in curing systems under study. Interestingly, the mixture of low molecular weight aromatic amines curing compositions exhibited the highest tensile strength and elongation among all materials studied. It means that slow curing with separated stage of composite formation leads to composite with more regular structure which improved their mechanical performance.

中文翻译：

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以脂肪胺和芳香胺为固化剂的聚氨酯/环氧复合材料的固化机理、动力学和力学性能研究

摘要 研究了以双酚A低聚二缩水甘油醚和支链低聚二苯甲烷二异氰酸酯和聚合脂肪胺或低分子量芳香胺混合物为固化剂的热固性聚氨酯/环氧树脂复合材料的固化动力学。结果表明，固化过程包括三个阶段：首先形成聚氨酯网络，然后胺固化剂与环氧环氧乙烷环反应形成线性低聚物，在固化的最后阶段，通过仲胺反应形成网络在第二阶段用环氧环氧乙烷环获得。Flynn-Wall-Ozawa 和 Kissinger-Akahira-Sunose 的等转化方法被用来研究活化能与固化程度的关系。通过这些方法确定的 Ea 和 α 之间的相关性表明，在所研究的固化体系中存在自催化效应。有趣的是，低分子量芳香胺固化组合物的混合物在所有研究的材料中表现出最高的拉伸强度和伸长率。这意味着复合材料形成的分离阶段缓慢固化导致复合材料具有更规则的结构，从而提高了其机械性能。