Study on reaction rate and kinetic constant in radiation curing of epoxy resins
Sui Gang1, Zhang Zuoguang1, Li Min1, Li Fengmei2*
1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875,China
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.