DIELECTRIC STUDY OF THE CRYSTAL AMORPHOUS INTERPHASE IN POLY(VINYLIDENE FLUORIDE) POLY(METHYL METHACRYLATE) BLENDS

We investigated the dielectric properties of crystalline poly(vinylide ne fluoride) (PVDF)/poly(methyl methacrylate) (PMMA) blends in a wide range of frequency f at various temperatures T A large peak of the die lectric loss epsilon''(f) due to the interfacial polarization was foun d in the blend below the frequency region of the alpha(c), process. Su ch a peak was not observed in neat PVDF. The difference may be ascribe d to the existence of a large amount of PMMA at the crystal-amorphous interphase in the blend. We also demonstrated that a low T peak in eps ilon''(T), which was thought of as an interfacial peak, is not related to the alpha(a)Li. process of PVDF in the interphase, but to the beta process of PVDF.