Research on Dielectric Properties about Different Curing Degree of Epoxy Glass Fiber

In order to explore the influence of curing process on production practice, the wide frequency dielectric spectroscopy measurement of epoxy resin and epoxy glass fiber was made. Combined with dielectric spectroscopy, dielectric parameters with frequency and temperature were discussed. Meanwhile, frequency domain characteristics of dielectric parameters were investigated under different curing temperature. Acetone extraction method was designed to test unsolvable component concentration of epoxy resin and epoxy glass fiber, thus the curing degree was obtained. The relationship of relative dielectric constant and curing degree was discussed. It is shown that the relative dielectric constant of epoxy glass fiber is higher than that of epoxy resin under the same curing process. At 150 °C, the longer the curing time, the higher the curing degree. There is a certain relationship expression between relative dielectric constant and curing degree at 10Hz. The dielectric dissipation factor of epoxy glass fiber is higher than that of epoxy resin.