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采用动态DSC法,研究了高韧性双马来酰亚胺树脂的固化反应动力学。根据Kissinger方程和Crane方程,拟合得到双马来酰亚胺树脂的固化动力学参数,建立了该树脂的唯象模型。采用恒温DSC法,根据DiBenedetto方程,建立了双马来酰亚胺树脂的玻璃化转变温度与固化度之间的函数关系。采用凝胶盘法,获得了该树脂在不同温度下的凝胶时间,建立了凝胶时间和凝胶温度之间的函数关系,得到了树脂的时间-温度-转变(TTT)图。根据TTT图对复合材料的固化工艺进行优化。结果表明:预浸料在150℃恒温0.5h后加压0.6 MPa,树脂具有一定的流动性,可制备内部质量完好的复合材料。
Using dynamic DSC method, the curing reaction kinetics of high toughness bismaleimide resin was studied. According to Kissinger equation and Crane equation, the curing kinetic parameters of bismaleimide resin were fitted and the phenomenological model of the resin was established. According to DiBenedetto equation, the glass transition temperature and curing degree of bismaleimide resin were established by constant temperature DSC method. The gelation time of the resin at different temperatures was obtained by the gel disk method. The functional relationship between gel time and gel temperature was established, and the time-temperature-transition (TTT) graph of the resin was obtained. The curing process of composites was optimized according to TTT chart. The results show that the prepreg is pressurized at 0.6 MPa at 150 ℃ for 0.5h, and the resin has certain fluidity and can be used to prepare composite materials with good internal quality.