▎ 摘　　要

Poly(vinyl alcohol)/Poly(vinylidene fluoride) blends reinforced with Nano -Graphene Platelets render piezo-electric by combining uniaxial plastic deformation end polarization. Comparative Broadband Dielectric Spec-troscopy on fresh and piezoelectric specimens were carried oud at various temperature and hydrostatic pressure states. Dc conductivity, which results from inter-NGP fluctuation induced tunneling of electrons through the effective potential barrier set by the polymer, involves two charge transfer mechanisms. The shift of the glass transition temperature and the temperature triggering a kinetic process due to the enhancement of the mobility of water molecules bound to PVA, upon pressure are detected indirectly through associated changes to the conductivity modes. NGP filling induces a couple of interfacial charge trapping. Relaxations exhibit different thermodynamics and different dependencies for fresh and piezoelectric specimens on pressure. Hydrostatic compression of heterogeneous matter results in an inhomogeneous internal stress field, whereas stress is locally amplified. In PNC, small scale relaxation is disturbed by the spatial fluctuation of the internal stress field. Rendering the PVdF grains piezoelectric, local stress amplification induces fluctuations of the local electric field. Fluctuations (of the internal stress or electric field) affect rather a short-range charge relaxation, rather than macroscopic dc conductivity.