Characterization, thermal and electrical properties of aminated PVC/oxidized MWCNT composites doped with nanographite

Abstract

The composites were prepared with PVC modified with 3-(dimethylamino)-1-propylamine (aminated PVC) and MWCNT containing 2.5% carboxyl group (oxidized MWCNT) and doped with nanographite in different percentages (1, 5, 8 and 12% by mass). Thermal investigation was performed from DSC and TGA curves. From the DSC curves, it was observed that T-g temperature of aminated PVC increased with the increase in oxidized MWCNT content. At the composite containing 5% MWCNT, T-g temperature of aminated PVC decreased slightly with increasing nanographite, at the composite containing 11% MWCNT increased slightly and at the composite containing 8% MWCNT nearly fixed. While according to initial decomposition temperature doping with nanographite did not affect significantly the thermal stability of composites, the amount of residue at 500 degrees C increased some with doping. Conductivity was only investigated for aminated PVC/8% oxidized MWCNT/8% nanographite composite. Doping with nanographite significantly increased the conductivity of the composite. (Conductivity increased values from 10(-8)-10(-9) S cm(-1) to 10(-4) S cm(-1)). The conductivity increased with increasing temperature at all frequencies. Conductivity-related activation energies were calculated at different frequencies, and while the frequency increased from 630 to 29,500 Hz, the activation energy decreased from 0.0228 to 0.0193 eV.