Dynamic Mechanical and Dielectric Properties of Polypropylene Nanocomposites

摘要

In this work we report on the investigation of the dynamics of raaleic anhydride grafted polypropylene (PPgMA) and PPgMA-based nanocomposites by means of dielectric relaxation spectroscopy (DRS) and dynamic mechanical thermal analysis (DMTA). We study the effects of different PPgMAs on the miscibility with the organoclay, and examine the effect of organically modified silicate filler on the dynamics of PPgMA. Our results suggest that the a-relaxation process, corresponding to the glass transition of PPgMA, is significantly affected by the clay loading. The increase in Tg is a direct result of polymer-filler interactions that reduce the polymer chain mobility. Furthermore, in the nanocomposite materials a separate high-temperature process due to Maxwell-Wagner-Sillars (MWS) polarization was observed with dielectric relaxation spectroscopy.