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采用动态力学分析法(DMA)对648环氧预浸料的等温固化过程进行了表征分析。以储能模量E′的相对增长率作为动态力学性能增长的指标,研究了不同恒温温度下E′的增长规律,并用Hsich非平衡热力学涨落理论、Avrami方程和等转变率3种方法研究了预浸料的等温固化动力学。结果表明:648环氧预浸料等温固化过程中E′的增长分为高温和低温2种增长模式,低温下包含一个高温下没有的模量增长的过渡阶段,该阶段与测试频率具有明显的相关性。Hsich非平衡热力学涨落理论、Avrami方程可以对648环氧预浸料等温固化过程储能模量的相对变化进行分段描述。对活化能的计算结果表明,不同温度范围内恒温储能模量增长过程中活化能的数值及其变化趋势不同。
The isothermal curing process of 648 epoxy prepreg was characterized by dynamic mechanical analysis (DMA). Taking the relative growth rate of storage modulus E ’as an index for the growth of dynamic mechanical properties, the growth law of E’ at different isothermal temperatures was studied. Three methods of Hsich non-equilibrium thermodynamic fluctuation theory, Avrami equation and equal transformation rate The isothermal curing kinetics of the prepreg. The results show that the growth of E ’in the process of isothermal curing of 648 epoxy prepreg is divided into two kinds of growth modes: high temperature and low temperature. Under low temperature, there is a transition phase with no modulus growth at high temperature. Correlation. Hsich non-equilibrium thermodynamic fluctuation theory, Avrami equation can be 648 epoxy prepreg isothermal curing process of the relative changes in storage modulus described in section. The calculation results of activation energy show that the values of activation energy and their changing trends are different in the process of increasing the storage modulus of constant temperature in different temperature ranges.