Effect of LiCl Filler on the Structure and Morphology of PVDF Films

Polyvinyldene fluoride (PVDF) films filled with LiCl of mass fraction range 2 ≤ W ≤ 10 wt% are prepared by casting technique by using N, N-dimethylacetamide as a solvent. Fourier Transform Infrared (FTIR) analysis indicates the presence of α and γ-phases of PVDF. The maximum content of these phases increment at 6 and 4 wt% LiCl, respectively. X-ray diffraction (XRD) studies carried out show that the degree of crystallinity increases as doped concentration increases up to 1 wt% and it is nearly constant up to 6 wt%. The presence of α and γ-phases is confirmed by XRD analysis. Morphology by scanning electron microscopy (SEM) shows that as the content of LiCl increases, the films' surface becomes rough with some small aggregates, but the particles are well distributed in the entire surface region. DC electrical conduction values increase with increasing temperature and filling level (FL) for all samples. This increase can be explained with the help of free volume theory.