Dielectric characterization of polyvinyl chloride/polymethyl methacrylate (PVC/PMMA) blends by TSDC technique

摘要

The present work focuses on the study of polyvinylchloride/polymethyl methacrylate (PVC/PMMA) blends. Films with different weight ratios of PMMA were prepared. The ATR-FTIR spectroscopy was used to study their miscibility. The TSDC was applied to study dielectric properties. The TSDC spectra of miscible blends (= 60 wt% of PMMA) have a single peak whose position is intermediate between the one of the two pure polymers as well as the activation energy, the fragility index and the compensation temperature were deduced using the fractional polarization technique. The maximal dielectric losses, which increase with the increase of PMMA content, are in the vicinity of the glass temperature.