Research for curing process of mica-containing epoxy resin-TOA system with dynamic dielectric spectroscopy

Abstract

The curing process of the mica-containing epoxy resin-TOA (tung oil anhydride) system was measured with a dielectric spectrometer at increasing temperatures. The theoretical analysis of the results of this dielectric spectroscopy and their experimental verification are presented. By processing the data of the tan delta versus T graph, the functional relation between the characteristic values T/sub b/, T/sub m/ of the spectroscopy and the curing reaction dynamic parameters E, k, t is established. By choosing a suitable frequency, the peak time on the tan delta -T spectroscopy is made equal to the gel time. It is concluded that this dielectric analysis at increasing temperatures makes it not only possible to study the curing characteristics of the curing reaction system but also to monitor and control the production of the stator windings of motors.<>