热重分析
热固性聚合物
降级(电信)
三嗪
傅里叶变换红外光谱
化学
氮气
解聚
等温过程
异氰酸
反应机理
热稳定性
材料科学
高分子化学
化学工程
有机化学
催化作用
电信
物理
计算机科学
工程类
热力学
作者
Paul R. Benjamin,Laurence Bailly,Didier Bégué,Christine Lartigau‐Dagron,Bouchra Hassoune‐Rhabbour,Valérie Nassiet
标识
DOI:10.1016/j.polymdegradstab.2023.110250
摘要
The non-isothermal thermal degradation of the cured phenolic triazine thermoset resin (PT30) was considered under nitrogen atmosphere. Thermogravimetric analyses (TGA) showed that the degradation mechanism was decomposed in three main steps occurring at 440°C, 550°C, and 720°C. To understand the chemical reactions that happen, TGA experiments were coupled with the analyses of the gaseous products by Fourier transform infrared detection (TGA/FTIR) and by mass spectrometry (TGA/MS). A degradation mechanism is proposed based on these experimental results and on Density Functional Theory (DFT) calculations. It was found that carbon dioxide is the main degradation product generated by the oxygen-carbon chain scissions. In the second step, triazine rings’ rupture led to the formation of cyanide hydrogen and probably cyanic/isocyanic acid. Then, various aromatic compounds are produced from chain scissions and molecules’ recombination. Analyses of these degradation products contributed to proposing assumptions of thermal degradation mechanisms of the PT30 resin.
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