MISCIBILITY AND MOLECULAR-MOTION OF POLY(METHYL ACRYLATE) POLY(VINYL ACETATE) BLEND AS STUDIED BY C-13 NMR IN THE SOLID-STATE

Miscibility and molecular motion of a poly(methyl acrylate)/poly(vinyl acetate) blend are studied by high-resolution solid-state C-13 NMR te chniques. Observed H-1 relaxation times indicate that they are miscibl e on the scale of 20-30 Angstrom. The temperature dependence of the C- 13 linewidth is examined to investigate effects of blending on molecul ar motion of each component polymer. Two models for the temperature de pendence of the correlation time of motion are examined. One is an Arr henius dependence and the other is a WLF dependence. Both models expla in the observed temperature dependence adequately. It is shown that by blending molecular motions of PMA and PVAc becomes similar.