Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5200689 | Polymer Degradation and Stability | 2017 | 15 Pages |
Abstract
The thermal degradation of polyisocyanurate foam samples were studied by TG/DTA, FTIR, and SEM. All samples with different isocyanate index (NCO/OHÂ =Â 100, 200, 300) were pre-treated by H2SO4, K2CO3, and NaOH before heating. The measurements of DTG and DTA presented corresponding variability for different acidic and alkaline treatments. The activation energy of thermal decomposition was calculated based on kinetic reaction evaluation. The pronounced polyol and isocyanate regenerations were observed over degradation. Further FTIR measurements at elevated temperatures suggested the possibility of acidic hydrogen bonding catalyzation and alkaline reversible amide regeneration during degradation by chemical treatments. The morphology and growth mechanism of localized corrosion and microcrystallization were characterized based on SEM micrographs.
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Authors
Jie Xu, Tao Wu, Chuang Peng, Stephen Adegbite,