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Dynamic modeling of curing process of epoxy prepreg

机译：环氧预浸料固化过程的动态建模

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The dynamic curing process was studied by using differential scanning calorimetry (DSC) and modeled by two methods. One was based on the Kissinger and Ozawa approach, in which the activation energy was taken as a constant for all the heating rates. The whole curing process was modeled with two cure reactions. Reaction 1 exhibited the behavior of the autocatalytic reaction, whereas Reaction 2 was the nth order reaction. The effect of heating, rate on the preexponential factor A(1) of Reaction 1 was apparent. As the heating rate increased, the A(1) decreased. There was no significant effect of heating rate on the preexponential factor A(2) of Reaction 2 and the reaction orders for both reactions. The calculated results showed that the contributions of these two reactions to the total curing. process were very different and changed with the heating rate. Except in the early cure stage, the calculated total degree of cure agreed well with the experimental data. Another method was based on the Borchardt and Daniels kinetic approach, where the activation energy of the cure reaction at each heating, rate was determined separately. The whole curing process was modeled with one autocatalytic reaction. The fitting results showed that both preexponential factor and activation energy increased with the increment of the heating rate. As in the first method, the effect of heating rate on the orders of reaction was very small. The calculated results agreed well with experimental values in the early cure stage. (C) 2002 Wiley Periodicals, Inc. [References: 17]
机译：使用差示扫描量热法（DSC）研究了动态固化过程，并通过两种方法进行了建模。一种是基于基辛格和小泽的方法，其中活化能被视为所有加热速率的常数。整个固化过程以两个固化反应为模型。反应1表现出自催化反应的行为，而反应2是n阶反应。加热速率对反应1的指数前因子A（1）的影响是显而易见的。随着加热速率的增加，A（1）降低。升温速率对反应2的指数前因子A（2）和两个反应的反应顺序均无显着影响。计算结果表明这两个反应对总固化的贡献。过程是非常不同的，并随加热速率而变化。除在早期治愈阶段外，计算出的总治愈程度与实验数据吻合良好。另一种方法是基于Borchardt和Daniels动力学方法的，其中分别确定每次加热速率下固化反应的活化能。整个固化过程以一个自催化反应为模型。拟合结果表明，预指数因子和活化能均随加热速率的增加而增加。与第一种方法一样，加热速率对反应顺序的影响很小。计算结果与治愈初期的实验值非常吻合。 （C）2002 Wiley Periodicals，Inc. [参考：17]

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