DIELECTRIC STUDIES ON THE MISCIBILITY IN POLY(VINYL ACETATE) POLY(ETHYL METHACRYLATE) BLENDS/

The glass transition relaxations of different blends of poly(vinyl ace tate) and poly(ethyl methacrylate) have been investigated by dielectri c relaxation spectroscopy in the frequency range from 20 Hz to 1 MHz. The obtained results suggest that the poly(vinyl acetate)-rich blends show immiscibility between the two components, whereas the poly(ethyl methacrylate)-rich blends show partial miscibility. The results obtain ed by differential scanning calorimetry and the analysis of the Maxwel l-Wagner-Sillars effect seem to confirm the dielectric relaxation resu lts. (C) 1996 John Wiley & Sons, Inc.