Chitosan composite film containing GO exhibits good proton conductivity. PBAT composite containing 40 wt.% of graphene nanoplatelets (GNPs) exhibited electrical and thermal conductivity of 3.15 W•m -1 •K -1 and 338 S•m -1 , respectively . GNPs improved the electrical conductivity for PLA/chitosan (75/25 wt./wt.) , and polyhedral oligomeric silsesquioxane/PCL (POSS-PCL) . The use of plasticizers such as glycerol improved the conductivity for poly(vinyl alcohol) (PVA) films and PVA/starch blend . Data analysis reveals that there is an increase of the conductivity for PVA with the increase in the content of glycerol and starch . The same observation was reported for