Novel imidazole derivatives with recoverable activity as latent curing agents for epoxy,Journal of Applied Polymer Science

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Novel imidazole derivatives with recoverable activity as latent curing agents for epoxy
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-08-05 , DOI: 10.1002/app.49730
Kunxiang Shi ₁ , Yucai Shen ₁ , Yunxu Yang ₁ , Tingwei Wang ₁

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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°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.

中文翻译：

具有可回收活性的新型咪唑衍生物，可作为环氧树脂的潜在固化剂

通过迈克尔加成反应，用甲氧基聚乙二醇马来酸酯二酯取代咪唑中仲胺上的氢原子，从而开发了一系列潜在的固化剂。分子量不同的甲氧基聚乙二醇马来酸酯二酯也抑制了咪唑环中叔胺的反应性。通过差示扫描量热仪和旋转流变仪测量改性咪唑/环氧体系的固化性能和适用期。改性的咪唑/环氧体系可以在175°C下快速固化。改性的咪唑显示出良好的潜伏期。储存超过1个月后，改性咪唑/环氧体系的粘度保持不变。链长的聚醚具有这些固化剂更好的热潜伏期。与未改性的咪唑相比，新型的潜在固化剂为固化的环氧树脂带来了更好的冲击强度。但是，如果聚醚单元的分子量超过750，则环氧树脂与潜在固化剂之间的相容性将变差。

更新日期：2020-08-05

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