采用差示扫描量热(DSC)和原位傅里叶变换红外光谱(FTIR)技术对乙炔封端聚异酰亚胺树脂固化特性进行了研究。利用原位动态和等温条件下的FTIR可以区分树脂单体中异酰亚胺-酰亚胺异构转变和乙炔基交联固化反应并确定各自的温度范围。异酰亚胺-酰亚胺的异构转变的反应温度低于乙炔基交联反应,原因是乙炔基交联固化反应的活化能为106.469kJ/mol,大于异酰亚胺的异构转变的活化能79.635kJ/mol。在200~220℃,乙炔封端聚异酰亚胺树脂可以实现预固化,后处理温度范围为300~350℃。
Abstract
The curing of acetylene-terminated polyisoimide oligomer was investigated using DSC and FTIR spectroscopy.Through dynamic and isothermal FTIR method,the isoimide-imide isomerization and crosslinking reactions of the oligomer was monitored individually and the temperature ranges of these two reactions were clearly determined.The fact that the isomerization occurred at a lower temperature ranges than the crosslinking is attributed to the difference between the activation energies of the two reactions,79.635kJ/mol for isomerization and 106.469kJ/mol for crosslinking.For the acetylene-terminated polyisoimide oligomer considered here,curing reaction was achieved to a sufficient extent at the temperature range of 200~220℃.Posture temperature is in the range of 300~350℃.
关键词
乙炔封端聚异酰亚胺树 /
异构转变 /
交联固化 /
活化能
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Key words
acetylene-terminated /
isomerization /
crosslinking /
activation energies
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参考文献
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