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根据非等温差示扫描量热(DSC)曲线,结合n级模型和自催化模型对酚醛树脂的固化动力学进行了研究,分析了DSC热行为,得到了固化特征温度,求解了固化反应动力学参数。采用分段拟合的方法建立了固化动力学模型,预测了动态条件下的固化行为,并分析了此树脂的固化行为特征。研究结果表明,固化反应前中期遵循自催化反应机理,固化后期符合n级反应模型,反应受扩散控制影响不明显。模型预测曲线与实验数据曲线吻合的很好,证实了此模型的准确性。研究还发现,Crane方程所求的反应级数不能准确描述此树脂体系的固化行为,并创新型采用线性拟合法求出反应级数。
According to non-isothermal differential scanning calorimetry (DSC) curves, the curing kinetics of phenolic resin was studied with n-stage model and autocatalytic model. The DSC thermal behavior was analyzed, the curing characteristic temperature was obtained, and the curing reaction kinetics parameter. The curing kinetic model was established by piecewise fitting method to predict the curing behavior under dynamic conditions. The curing behavior of the resin was also analyzed. The results show that the autocatalytic reaction mechanism is followed in the middle of the curing reaction and the n-reaction model in the latter stage of curing is followed. The reaction is not affected obviously by the diffusion control. The model predictive curve is in good agreement with the experimental data curve, confirming the accuracy of this model. The study also found that the Crane equation for the reaction series can not accurately describe the curing behavior of this resin system, and innovative use of linear fit to find the reaction series.