Crystal Structure Control of Poly(vinylidene fluoride) Using Solvent Casting

Abstract

Poly(vinylidene fluoride) (PVDF) has three crystal structures: forms I, II, and III. Each structure was fabricated by solvent casting using various solvents. In this study, we demonstrated how to fabricate forms I, II, and III using one solvent (hexamethylphosphoric triamide), The results and revealed that the crystal structure of PVDF depended on the evaporation rate of the solvent. Eventually, Form I was formed into when the evaporation rate was slow, Form II was formed when it was fast, and form III was formed at the evaporation rate between form I and II.