Miscibility and Crystallinity Study of Poly(vinylidene Fluoride) / Poly(L-Lactic Acid) Polymer Blend

Abstract The crystallinity and miscibility behavior of poly (vinylidene fluoride)/poly (L-lactic) acid (PVDF/PLLA) blend over a wide composition range in solution and cast film were investigated. The blend films were characterized using Differential Scanning Calorimetry (DSC), Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD) and Viscometry measurement. The interaction parameters were calculated using Pinping, Krigbaum and Garcia’s interpretation which were derived from Flory-Huggins theory. The calculation revealed that the PVDF/PLLA blend is miscible for all composition in the solution. DSC results shows two shifted glass transition temperature indicating blends are partially miscible in the solid state. The partial miscibility was due to the molecular interaction between –C=O of PLLA and -C-H of PVDF evidenced from the FTIR spectrum. Moreover, PLLA in the blend could enhance the overall crystallinity of the samples.