Abstract In this work, three epoxy resins including diglycidyl ethers of N,N′-bis(2-hydroxyethyl)pyromellitimide (DIDGE), bisphenol-A (BADGE), and polyethylene glycol (PEDGE) were isothermally cured by an amine curing agent possessing N,N′-disubstituted pyromellitimide units (denoted by DIDAM). DIDGE resin was synthesized from the reaction of N,N′-bis(2-hydroxyethyl)pyromellitimide with an excess of epichlorohydrin. Also, DIDAM curing agent was prepared from the reaction of pyromellitic dianhydride with an excess of ethylene diamine. Completion of the isothermal curing processes was approved by both Fourier transform-infrared spectroscopy and non-isothermal differential scanning calorimetry (DSC). The DSC traces showed only the phase transitions related to the thermal degradation of the resulting thermosets. According to the thermogravimetric analyses, the DIDGE/DIDAM thermoset showed higher thermal stability at temperatures above 425 °C than the other two thermosets. While BADGE/DIDAM and PEDGE/DIDAM thermosets showed about 70% weight loss in the thermal range of 400–850 °C, DIDGE/DIDAM thermoset was encountered with only about 40% weight loss. The glass transition temperatures (Tg ) of the resulting thermosets were determined using tan δ vs temperature plots obtained from dynamic mechanical thermal analysis. The Tg values of BADGE/DIDAM, DIDGE/DIDAM, and PEDGE/DIDAM thermosets were found to be 211 °C, 189 °C, and 81 °C, respectively. Graphical Abstract

中文翻译：

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具有N,N'-二取代均苯四酰亚胺单元的环氧树脂热固性材料的热稳定性和动态机械热分析

摘要 在这项工作中，包括 N,N'-双（2-羟乙基）均苯四甲酰亚胺 (DIDGE)、双酚 A (BADGE) 和聚乙二醇 (PEDGE) 的二缩水甘油醚三种环氧树脂通过具有N,N'-二取代的均苯四甲酰亚胺单元（由 DIDAM 表示）。DIDGE树脂由N,N'-双(2-羟乙基)均苯四甲酰亚胺与过量的表氯醇反应合成。此外，DIDAM 固化剂是由均苯四酸二酐与过量乙二胺反应制备的。傅里叶变换红外光谱和非等温差示扫描量热法 (DSC) 均批准了等温固化过程的完成。DSC 曲线仅显示与所得热固性塑料的热降解相关的相变。根据热重分析，DIDGE/DIDAM 热固性材料在 425°C 以上的温度下表现出比其他两种热固性材料更高的热稳定性。虽然 BADGE/DIDAM 和 PEDGE/DIDAM 热固性材料在 400-850 °C 的热范围内表现出约 70% 的重量损失，但遇到 DIDGE/DIDAM 热固性塑料时仅损失约 40% 的重量。所得热固性塑料的玻璃化转变温度 (Tg ) 使用从动态机械热分析获得的 tan δ 与温度图确定。发现 BADGE/DIDAM、DIDGE/DIDAM 和 PEDGE/DIDAM 热固性塑料的 Tg 值分别为 211 °C、189 °C 和 81 °C。图形概要 虽然 BADGE/DIDAM 和 PEDGE/DIDAM 热固性材料在 400-850 °C 的热范围内表现出约 70% 的重量损失，但遇到 DIDGE/DIDAM 热固性塑料时仅损失约 40% 的重量。所得热固性塑料的玻璃化转变温度 (Tg ) 使用从动态机械热分析获得的 tan δ 与温度图确定。发现 BADGE/DIDAM、DIDGE/DIDAM 和 PEDGE/DIDAM 热固性塑料的 Tg 值分别为 211 °C、189 °C 和 81 °C。图形概要 虽然 BADGE/DIDAM 和 PEDGE/DIDAM 热固性材料在 400-850 °C 的热范围内表现出约 70% 的重量损失，但遇到 DIDGE/DIDAM 热固性塑料时仅损失约 40% 的重量。所得热固性塑料的玻璃化转变温度 (Tg ) 使用从动态机械热分析获得的 tan δ 与温度图确定。发现 BADGE/DIDAM、DIDGE/DIDAM 和 PEDGE/DIDAM 热固性塑料的 Tg 值分别为 211 °C、189 °C 和 81 °C。图形概要 发现 PEDGE/DIDAM 热固性塑料的温度分别为 211 °C、189 °C 和 81 °C。图形概要 发现 PEDGE/DIDAM 热固性塑料的温度分别为 211 °C、189 °C 和 81 °C。图形概要