Friction and Wear Properties and Dielectric Properties of Graphene Oxide and Chopped Carbon Fiber Modified Polyvinylidene Fluoride Composite Films

The graphene oxide (GO), chopped carbon fiber (CF) modified poly(vinylidene fluoride)(PVDF ) composite films were prepared by the solution casting process. The Friction and wear properties of composite films and dielectric property were studied by friction and wear tester and digital electric bridge, respectively. The results show that when GO or CF content was low (<1 vol.%), the friction coefficient of the films decreased and tended to be stable with time. When the content of GO or CF in the films was high, the films showed various behaviors. The friction coefficient for the former increased with time, while the later had an almost stable friction coefficient. With addition of GO or CF increasing, the dielectric constant of the composite films rose and then dropped, whilst the dielectric-loss decreased at first and then increased. And with the frequency increase the dielectric constant had a slow drop, and the dielectric-loss initially rose and then reduced dramatically.