Effect of TiO_2 Nano Fillers on the Electrical Conductivity of PSAN/TiO_2 Polymer Nanocomposites

摘要

The microstructural characterization of Polystyrene co-acrylonitrile and Titanium dioxide (PSAN/TiO_2) nanocomposites has been performed by Positron Annihilation Lifetime Spectroscopy. The decrease of positron lifetime parameters viz. o-Ps lifetime (τ_3) and free volume size (V_f) up to 0.6 wt% of TiO_2 is attributed to the filling of free volume holes by TiO_2 nanoparticles. The increased free volume size (V_f) after 0.6 wt% of TiO_2 indicates the formation of interface due to TiO_2 nanoclusters. The variation of electrical conductivity at the lower and higher concentration of TiO_2 in (PSAN/TiO_2) nanocomposites is attributed to the blocking effect and space charge effect respectively.