Crystal Structure Control of Poly(vinylidene fluoride) (PVDF) in the Blend Films of PVDF and Poly(methyl methacrylate) (PMMA) Prepared by Solvent Casting

Abstract

This paper discusses the fabrication method of Poly(vinylidene fluoride) (I) crystal having excellent dielectric properties. We tried to control the crystal structure of PVDF in the blend films of PVDF and Poly(methyl methacrylate) (PMMA) prepared by solvent casting. PVDF/PMMA = 60/40 wt.% blend was dissolved in DMF solvent at 120°C. After casting, the PVDF/PMMA blend films were baked at 150°C (B). Each film was quenched (Q) from melting state and then was annealed at 120°C (QA). As a result, we demonstrated that PVDF (I) crystal grows preferentially under the existence of PMMA. That the crystallization speed of the quenched and annealed PVDF/PMMA blend films (QA) with the blend ratio of PVDF/PMMA = 60/40 wt.% is comparatively slow and forms the PVDF (I) crystal.