采用模型拟合法对环氧树脂固化特性进行模拟和预测时,因涉及机理假设和参数的选取,所以在处理复杂反应时具有一定的局限性.文中采用非模型拟合法中的非线性Vyazovkin(NLV)法对一种高韧性低收缩环氧树脂体系固化动力学进行研究.通过拟合活化能与固化度的关系表明:等温条件下该体系经历了三个截然不同的阶段;非等温条件下,由于温度变化的影响,各阶段活化能的变化是多种因素共同作用的结果.使用NLV法对该体系的等温固化数据进行预测,预测数据与DSC实验数据基本吻合.NLV法在150℃～180℃的固化温度下能较好地描述该体系的等温固化反应过程.
The traditional model kinetics methods need to choose model and adjust the parameters in model to simulate the curing process of epoxy resin, which bring limitations to its application when the kinetics is relatively complicated.This paper employed a model-free method named as non-linear Vyazovkin(NLV) method and developed a numerical method of which to study the curing kinetics of a high toughness and low volume shrinkage ratio epoxy system The dependences of the activation energy on the extent of conversion indicated that: under isothermal condition, there are three different phases through the curing process; otherwise, under nonisothermal condition, due to the variable of temperature, the activation energy is affected by the interaction of multiple factors in each phase.The predictive data derived from NLV method gave satisfactory agreement with that of experiment in the range 150 ℃～180℃.
参考文献
| [1] | 范永忠,孙康,吴人洁.热固性树脂固化的非模型反应动力学研究[J].高分子材料科学与工程,2001(01):60-63. |
| [2] | Vyazovkin S. .EVALUATION OF ACTIVATION ENERGY OF THERMALLY STIMULATED SOLID-STATE REACTIONS UNDER ARBITRARY VARIATION OF TEMPERATURE[J].Journal of Computational Chemistry: Organic, Inorganic, Physical, Biological,1997(3):393-402. |
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