环氧树脂辐射固化反应速率及速率常数的研究

研究了环氧树脂溶液的电子束辐射固化反应速率常数以及树脂特性对反应速率的影响.研究结果显示,辐射反应增长速率常数k_p和终止速率常数k_t在反应进行的不同阶段表现出不同的控制机制.环氧树脂的分子量及其分布,分子化学结构对辐射反应速率都有很大影响,反应速率大的树脂体系最终达到的反应程度也高.

Study on reaction rate and kinetic constant in radiation curing of epoxy resins

The kinetic studies on electron beam curing of epoxy resins were made in this paper. The kinetic characteristics of different epoxy resin in acetonitrile solution are explored. The propagation kinetic constant has no evident change at initial stage and begins to decrease after some conversion. While the termination reaction is reaction-diffusion-controlled throughout the reaction process, and the termination kinetic constant is decreased gradually. The reaction rate of radiation systems decreases with the increasing molecular weight of epoxy resin and the reaction rate of the sample with high polydispersity is higher at the same reaction extent. For the epoxy resin systems whose chemical structure of molecules is different, the reactivity of samples under radiation can be greatly affected by density of functional groups and space obstacle in molecular structures. The radiation system with a higher reaction rate can get to higher conversion during the radiation process.