The synthesis of bi‐ and tetra‐functional tri‐aryl ether epoxy resin isomers and their subsequent cure with 44 diamino diphenyl sulphone (DDS) is presented here. The effect of varying aromatic substitution and cross‐link density on the structure, property, and processing relationships is explored for 1,3 bis(3‐glycidyloxyphenoxy)benzene (133 BGOPB), 1,4 bis(4‐glycidyloxyphenoxy)benzene (144 BGOPB), N,N,N,N‐tetraglycidyl 1,3‐bis (3‐aminophenoxy) benzene (133 TGAPB), and N,N,N,N‐tetraglycidyl 1,4‐bis (4‐aminophenoxy) benzene (144 TGAPB). Meta substitution to the aromatic ring reduces the rate of reaction, glass transition temperature, yield strain and crosslink density, coefficient of thermal expansion, and side reactions, while increasing strain softening, compressive modulus and strength, and methyl ethyl ketone ingress. Increasing crosslink density increases the glass transition temperature, promotes side reactions during cure, and increases compressive modulus, strength, and yield strain, while reducing coefficients of thermal expansion, methyl ethyl ketone ingress, and density. The results are discussed in terms of packing efficiency of the meta‐substituted epoxy resins and the role of short range molecular mobility caused by the lack of an aromatic axis of rotation.

中文翻译：

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三芳基醚环氧树脂异构体的合成及其与二氨基二苯砜的固化

本文介绍了双和四官能三芳基醚环氧树脂异构体的合成及其随后用 44 二氨基二苯砜 (DDS) 进行固化。针对 1,3 双（3-缩水甘油氧基苯氧基）苯（133 BGOPB）、1,4 双（4-缩水甘油氧基苯氧基）苯（144 BGOPB)、N,N,N,N-四缩水甘油基 1,3-双 (3-氨基苯氧基) 苯 (133 TGAPB) 和 N,N,N,N-四缩水甘油基 1,4-双 (4-氨基苯氧基) 苯 ( 144 TGAPB）。芳环的间位取代降低了反应速率、玻璃化转变温度、屈服应变和交联密度、热膨胀系数和副反应，同时增加了应变软化、压缩模量和强度以及甲基乙基酮的进入。增加交联密度会增加玻璃化转变温度，促进固化过程中的副反应，并增加压缩模量、强度和屈服应变，同时降低热膨胀系数、甲基乙基酮进入和密度。结果根据间位取代环氧树脂的填充效率和由于缺少芳香族旋转轴而导致的短程分子迁移率的作用进行了讨论。