Influence of the spinning rate on the β-phase formation in poly(vinylidene fluoride) (PVDF) films

In this work, the effect of rotational speed on the β-phase formation in PVDF films is investigated. The rotational speeds use in this work are 500, 1000, 2000 and 4000 rpm. All films are left to dry at room temperature. FTIR and XRD technique are employed to determine the phase formation while SEM is used to investigate the morphology of the films. The FTIR and XRD measurements confirm that the main phase formed in all PVDF films is β-phase. However, the β-phase contents vary with the spinning rate and the highest content is observed approximately 83% for 500 rpm film. SEM micrographs show the surface of all samples is porous structure and rough.