Thermal and electrical characterization of poly(vinyl)alcohol)/poly(vinylidene fluoride) blends reinforced with nano-graphene platelets

Nano-graphene/polymer composites can function as pressure induced electro-switches, at concentrations around their conductivity percolation threshold. Close to the critical point, dependence of electron tunneling through polymer barrier separating nano-graphene's results from competition among shortening length and increase polymer's polarizability. Such switching behavior was recently observed in polyvinyl alcohol (PVA) loaded with nano-graphene platelets (NGPs). In this work, PVA is blended ?-poly(vinylidene fluoride) (PVdF) NGPs. Coaxial mechanical stress electric field render nano-composite piezoelectric. We investigate influence heterogeneity, thermal properties, phase transitions kinetic processes occurring matrix on macroscopic electrical interfacial polarization casted specimens. Furthermore, effect electro-activity PVdF grains properties are comparatively studied. Broadband Dielectric spectroscopy employed resolve inspect transport trapping respect traced via Differential Scanning Calorimetry. The harmonic applied during a BDS sweep induces volume modifications electro-active grains, while, disturb internal that free (or bound) electric. dc dielectric relaxation found exhibit weak dependencies.