采用热重-差热分析仪研究玻璃纤维/环氧树脂复合材料在空气及氮气氛围下不同升温速率的热解特性规律。结果表明,在空气气氛下,热解分为两个阶段;氮气气氛下,热解只存在一个热分解阶段,与空气气氛相比热解初始分解温度较高,热解温度范围变窄,失重速率明显变大。在两种气氛下,玻璃纤维均不参与热解。随着升温速率的增加,热解反应各阶段的起始温度、终止温度、最大失重速率温度均向高温方向移动,热解温度范围大小都基本保持不变。氮气气氛下使用Kissinger法、FWO法和Starink法计算出玻璃纤维环氧树脂的平均表观活化能分别为106.42、123.09和119.48kJ/mol。复合材料活化能随转化率的增加而升高,表观活化能保持在一定数值范围内且数值相近,热解反应比较稳定,具有较低A值,表明其具有较强的热稳定性。
The pyrolysis characteristics of glass fiber/epoxy resin composites at different heating rates in air and nitrogen atmospheres were studied by thermogravimetry and differential thermal analysis.The results showed that the pyrolysis was divided into two stages in air atmosphere.However,in nitrogen atmosphere,there was only one pyrolysis stage.Compared with air atmosphere,the initial pyrolysis temperature was higher,the range of pyrolysis temperature became narrower,and the weight loss rate significantly increased.In both atmospheres,glass fibers did not participate in pyrolysis.With the increase of the heating rate,the starting temperature,the ending temperature and the maximum weight loss rate temperature of each stage of the pyrolysis reaction moved to the high temperature direction,and the size of the pyrolysis temperature range remained basically unchanged.The average apparent activation energies of glass fiber epoxy resin calculated by Kissinger,FWO and Starink methods under nitrogen atmosphere were 106.42kJ/mol,123.09kJ/mol and 119.48kJ/mol,respectively.The activation energy of the composites increased with the increase of the conversion rate,and the apparent activation energy remained within a certain range with similar values.The pyrolysis reaction was relatively stable with a low A value,indicating that the composites had strong thermal stability.
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基金资助
国家自然科学基金(61901283);辽宁省自然科学基金(201602567)
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