Silver nano-particle embedded polyvinylidene fluoride (PVDF) and poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) was prepared by in-situ chemical reaction. The formation of silver nanoparticles was confirmed by UV-vis spectroscopy and HR-TEM image analysis. The weight percentage of silver nano-particle was estimated by thermogravimetric analysis (TGA). Nonisothermal melt-crystallization kinetics and nucleation of molten polymers were analyzed by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Different parameters coming from the DSC data recommended that silver nano-particle enhanced the molecular chain mobility of molten PVDF during its crystallization but for PVDF-HFP it hindered the chain mobility. The values of effective activation energies, calculated by the differential isoconventional method supported the results. Fourier transform infrared spectroscopy (FT-IR) and melting thermograms of different samples concluded that silver nano-particles helped to form polar beta-phase of molten PVDF during crystallization but it was ineffective for PVDF-HFP. (C) 2017 Elsevier B.V. All rights reserved.