Revealing the Interrelation between Hydrogen Bonds and Interfaces in Graphene/PVA Composites towards Highly Electrical Conductivity

•The effect of interface interaction on the conductivity was study in detail.•A “Cage Effect” phenomenon between the graphene and PVA matrix was proposed.•Such a proposed CE was combined with the classical theory to boost conductivity.•A superior conductivity (25 S m−1) at 6.25 wt% graphene was obtained.