Dynamic conductivity of multilayer graphene during pulsed mechanical activation of a composite (polypropylene - graphene nanoplatelets)

Abstract

Polymer composite films of polypropylene and graphene nanoplatelets were subjected to mechanical activation . Electrical current pulses are observed during this process. Fourier transforms of the signals are fitted to Havriliak-Negami model and the Kubo model for multilayer graphene. The calculated frequency dependences of conductivity are in good agreement with the experimental results. Relaxation processes and changes in the local geometry of graphene sheets under the influence of elastic waves are responsible for the effects. • Thin films of polypropylene and graphene nanoplatelets are subjected to mechanical activation. • Electrical current pulses are observed. • Fourier transforms of the signals are described by the Kubo model for multilayer graphene.