摘要
采用TGA—FTIR联用技术在高纯氮气保护下实时研究了环氧树脂酸酐固化物热降解过程和气相产物。TG和DTG曲线表明，环氧树脂酸酐固化物存在着2个热失重阶段，最大热失重速率峰值温度分别在163℃和389℃，其失重温度范围分别在100。210℃和260。570℃。FTIR谱图表明第一失重阶段主要是体系中所含的水分挥发和／或伯醇脱水及一些小分子物质挥发过程。CO和酮类物质分别产生于280℃和305℃，并一直持续到本实验结束；酸酐类物质在455℃以下时吸收峰的强度很微弱，此后逐步增强。此外，环氧树脂酸酐固化物热降解气相挥发物还有各种碳氢混合物。
The evolution of the gas evolved during the thermal degradation of a diglycidyl ether of bisphenol A - based epoxy resin cured with methyhetrahydrophthalic anhydride （EP） had been investigated real time in an inert atmosphere （nitrogen） using TGA coupled to FTIR technique . The TG and DTG curves involved two main steps whose maximum weight loss rate was at 163 ℃ and at 389 ℃ （DTG curve）. The first weight loss of EP took place in the range of 100 ～ 210 ℃. The second weight loss of EP took place in the range of 260 ～ 570 ℃. The interpretation of the FTIR spectrograms corresponding to the temperatures of maximum decomposition rate for each decomposition step showed that EP started from the dehydration of the secondary alcohol, leading to the formation of water and vinylene ethers in the range of 100 ～ 210 ℃. Carbon monoxide and ketones were evolved at 280 ℃ and 305 ℃ respectively. Phthalic anhydride was also evident by FTIR. Phthalic anhydride was regenerated in large quantities on thermal decomposition of anhydride cured epoxy resins at high temperature （ 〉 455 ℃ ）. Upon further decomposition, aliphatic chain ends produced light combustible gases, ketone and various hydrocarbons mixtures.
出处
《热固性树脂》
CAS
CSCD
2007年第2期31-34,共4页
Thermosetting Resin
