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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >INFLUENCE OF CURE SCHEDULE AND STOICHIOMETRY ON THE DYNAMIC MECHANICAL BEHAVIOUR OF TETRAFUNCTIONAL EPOXY RESINS CURED WITH ANHYDRIDES
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INFLUENCE OF CURE SCHEDULE AND STOICHIOMETRY ON THE DYNAMIC MECHANICAL BEHAVIOUR OF TETRAFUNCTIONAL EPOXY RESINS CURED WITH ANHYDRIDES

机译：固化时间和化学计量法对酸酐引起的四官能环氧树脂动态力学行为的影响

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摘要

Epoxy networks based on N,N,N',N'-tetraglycidyl-4,4'-diamino diphenylmethane (TGDDM) prepolymer were prepared with cis-1,2,3,6-tetrahydrophthalic anhydride (THPA) curing agent at anhydride/epoxy group ratios varying from 0.3 to 1.0. For post-cured mixtures, dynamic mechanical tests show that the glass transition temperature reaches the maximum value at stoichiometric ratios between 0.8 and 0.9. This behaviour has been related to the crosslink density of the formed networks, and also to etherification reactions occurring during cure which lower the amount of anhydride needed in order to complete the curing process. The study of cure cycle variations on the viscoelastic properties showed that for epoxy/anhydride mixtures high post-cure temperatures could be needed to reduce the amount of unreacted epoxy groups after curing. Fourier transform infra-red spectroscopy has been used to analyse the residual epoxy groups and also to study the influence of the different cure reactions on the physical properties of these networks. Copyright (C) 1996 Elsevier Science Ltd. [References: 33]
机译：使用N / N，N'，N'-四缩水甘油基-4,4'-二氨基二苯甲烷（TGDDM）预聚物为基础的环氧网络，采用顺式1,2,3,6-四氢邻苯二甲酸酐（THPA）固化剂在酸酐/环氧基的比率在0.3到1.0之间变化。对于后固化混合物，动态力学测试表明，玻璃化转变温度以化学计量比介于0.8和0.9之间达到最大值。该行为与所形成的网络的交联密度有关，还与固化过程中发生的醚化反应有关，醚化反应降低了完成固化过程所需的酸酐量。固化循环变化对粘弹性的研究表明，对于环氧/酸酐混合物，可能需要较高的后固化温度，以减少固化后未反应的环氧基的数量。傅里叶变换红外光谱已用于分析残留的环氧基，还用于研究不同固化反应对这些网络的物理性能的影响。版权所有（C）1996 Elsevier Science Ltd. [参考：33]

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