摘要
用全动态DSC研究了先进复合材料用高性能双组份环氧树脂的固化反应动力学,获得了固化反应的动力学参数,并建立了固化动力学的唯象模型。用恒温DSC和动态DSC结合DiBenedetto方程研究了树脂玻璃化转变温度和固化度之间的关系,并给出了玻璃化转变温度Tg和时间t及温度T之间的数学关系。通过DMA研究了树脂恒温下的凝胶过程,给出了凝胶时间tgel和凝胶温度T之间的关系,回归得到凝胶时的固化度为αgel=0.4539,并以此计算出了Tg,gel=70.18℃,为工艺选择提供了依据。并在此基础上绘制出了该树脂体系的TTT图,提出了将TTT图用于工艺优化的思路,并做了初步验证。
The cure kinetics of a bicomponent high performance epoxy resin was studied by dynamic DSC analysis, and the parameters of the cure reaction were obtained to establish a phenomenological model. The relationship between glass transition temperature （Tg） and cure degree （a） was analyzed with an isothermal plus dynamic DSC method based on DiBenedetto equation, and a mathematical description of Tg as a function of both time and temperature was suggested. Round disk compression mode DMA was employed to study the gelation at different temperatures, and the relationship between gel time and temperature was obtained. The conversion at gelation turned out to be agel =0. 4539, while the temperature at which vitrification line and gelation line transected was found to be Tg.gel = 70. 18℃. The time-temperature-transition （TTT） diagram was plotted based on the works above, which served as a tool for process optimization in advanced composites manufacture.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2006年第1期17-25,共9页
Acta Materiae Compositae Sinica
基金
国家973课题项目"先进聚合物基复合材料的多层次结构和性能研究"的04子课题(2003CB615604)
