Two test methods for obtaining activation energy of epoxy resin and their effectiveness analysis

Abstract

Activation energy, as an intrinsic property to characterize the insulation state of materials, has important applications in the aging state and life assessment of insulating materials. How to calculate the activation energy of epoxy resin accurately and how to grasp the applicability of different calculation methods are the hot issues in current research. At present, the main methods of calculating activation energy include thermogravimetric method and dielectric spectrum method. there are some differences in the physicochemical connotation of activation energy obtained by these two methods. This paper introduces the method of obtaining activation energy and its applicability. With epoxy resin as an example, analysis of the two kinds of activation energy of the physical and chemical process, studies the thermogravimetric method of chemical activation energy and the dielectric spectrum method to calculate the relaxation activation energy, the results show that chemical activation energy on behalf of the energy required to overcome the barrier of the chemical reaction, relaxation activation energy represents the micro motion unit under the effect of electric field to move the energy to overcome. The activation energies measured by the two methods are obviously different, and their application ranges are also obviously different.