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化工学报  2014 

液体乙烯基硅树脂的制备及固化反应动力学

DOI: 10.3969/j.issn.0438-1157.2014.04.048, PP. 1509-1516

Keywords: 乙烯基硅树脂,反应动力学,自催化,动力学模型,Vyazovkin法,Málek方法

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Abstract:

合成了一种液体乙烯基硅树脂,并用FT-IR、GPC、1HNMR和29SiNMR等手段对其结构进行表征。采用非等温差示扫描量热法(DSC)研究了乙烯基硅树脂/苯基含氢硅油体系的固化反应动力学,用Kissinger方程和高级等转化率法(Vyazovkin方法)分别计算了该体系的表观活化能Ea,用Málek法进行模型拟合动力学分析,通过T-β外推法确定该体系的固化工艺参数。结果表明:Kissinger法和Vyazovkin法得到的活化能分别为85.3kJ·mol-1和84.0kJ·mol-1,二者所得结果的差别较小;乙烯基硅树脂体系固化动力学符合?esták-Berggren(m,n)模型,m和n分别为0.092、1.440,拟合曲线与实验的DSC曲线吻合;该树脂体系的近似凝胶化温度为89.1℃,固化温度为127.8℃,后处理温度157.6℃。

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