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采用差示扫描量热(DSC)法和热重(TG)分析法考察了双环戊二烯(DCPD)/苯乙烯(St)共聚树脂在N2中的热分解过程,并根据Friedman法(多加热速率法)和Kissinger法(代替高解析法)计算出热分解反应的动力学参数。在动力学研究的基础上,对DCPD/St共聚树脂使用寿命进行了预测。结果表明:DCPD/St共聚树脂的热分解反应过程大致可分为前期(失重率≤20%)、中期(失重率为30%～80%)和后期(失重率≥90%)3个阶段,前期和中期反应可以认为是1级反应,中期反应的平均活化能为150.43 kJ/mol;热分解温度随着升温速率的增加而提高,热分解反应活化能随着失重率的增加而增大;当温度低于200℃时,DCPD/St共聚树脂具有较好的热稳定性。
The thermal decomposition of dicyclopentadiene (DCPD) / styrene (St) copolymer in N2 was investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) Rate method) and Kissinger method (instead of high-resolution method) to calculate the kinetic parameters of the thermal decomposition reaction. Based on the kinetic study, the service life of DCPD / St copolymer resin was predicted. The results showed that the thermal decomposition process of DCPD / St copolymer resin can be divided into three stages: early stage (weight loss rate≤20%), medium period (weightlessness rate30% ~ 80%) and late stage (weight loss rate≥90% The first-stage and middle-stage reaction can be considered as the first order reaction. The average activation energy of the mid-term reaction is 150.43 kJ / mol. The pyrolysis temperature increases with the increase of the heating rate. The activation energy of the pyrolysis reaction increases with the increase of the weight loss rate. When the temperature is below 200 ℃, DCPD / St copolymer resin has good thermal stability.