Novel imidazole derivatives with recoverable activity as latent curing agents for epoxy

被引：16

作者：

Shi, Kunxiang ^{[1
]}

Shen, Yucai ^{[1
]}

Yang, Yunxu ^{[1
]}

Wang, Tingwei ^{[1
]}

机构：

[1] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 211816, Jiangsu, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2021年 / 138卷 / 04期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

differential scanning calorimetry; thermal properties; thermosets; MECHANICAL-PROPERTIES; RESIN; CATALYSTS; MICROCAPSULES; TEMPERATURE; PERFORMANCE; SYSTEMS; BLENDS;

D O I：

10.1002/app.49730

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of latent curing agents were developed by replacing the hydrogen atom on secondary amine in imidazole with methoxy polyethylene glycol maleate diesters via Michael addition reaction. Methoxy polyethylene glycol maleate diesters with different molecular weight also restrained the reactivity of tertiary amine in imidazole ring. The curing properties and pot-life of the modified imidazole/epoxy systems were measured by differential scanning calorimeter and rotational rheometer. The modified imidazole/epoxy system could be cured quickly at 175 degrees C. The modified imidazole shows good latency. After stored for more than 1 month, viscosity of modified imidazole/epoxy system remains unchanged. The longer chain polyether had the better thermal latency these curing agents had. Compared with unmodified imidazole, the novel latent curing agents led to better impact strength for cured epoxy. However, the compatibility between epoxy and latent curing agent will get worse if the molecular weight of polyether unite is over 750.

引用

页数：10

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