环氧树脂
缩水甘油醚
差示扫描量热法
材料科学
等温过程
玻璃化
动力学
复合材料
双酚A
玻璃化转变
活化能
扩散
热固性聚合物
高分子化学
化学
聚合物
热力学
有机化学
物理
男科
医学
量子力学
作者
Hongjie Xu,Guofeng Tian,Yan Meng,Xiaoyü Li,Dezhen Wu
标识
DOI:10.1016/j.tca.2021.178942
摘要
Cure kinetics of a methyl nadic anhydride cured tertiary epoxy (i.e., Diglycidyl ether of bisphenol A, a tetrafunctional epoxy and a fluorine-containing diepoxy), which is potential matrix for a polyimide fiber reinforced composites, were studied using dynamic and isothermal differential scanning calorimeter scans. Results showed that addition of the tetrafunctional epoxy and fluorine-containing diepoxy has negligible effects on the underlying cure mechanisms. Variation of glass transition temperature with extent of cure can be fitted using DiBenedetto equation. The Kamal model coupled with an empirical diffusion factor can adequately model the isothermal cure data. The Kamal model can model the reaction data well before vitrification. However, after vitrification, obvious deviation from Kamal model was observed, which have to be corrected using a diffusion factor. The apparent activation energy obtained from the Kamal model using isothermal data, agrees with that from the advanced isoconversional method, which utilizes the dynamic cure data.
科研通智能强力驱动
Strongly Powered by AbleSci AI