A study on the structural changes and electrical properties due to 2nd heat-treatment on the polymer

The changes and stability of the structure in polymer which was varied with the ratio of additives addition and the postcuring heat-treatment have been explained through the estimation of the distributed relaxation times in the dielectric properties and the contribution of the ions at low-frequency and high-temperature regions. In the dielectric properties, the a peak related with Tg of epoxy network appeared near 130[/spl deg/C], the conduction loss due to thermal dissociation of hardener above 150[/spl deg/C] started off in the low frequency side below 330[Hz]. The anomalous dielectric behaviours of polymers at low frequencies and high temperature regions have been interpreted in terms of diffusion of impurity ions.