Investigation on dielectric properties of polypropylene/waste low density polyethylene blends

Polypropylene(PP)and waste recycled low density polyethylene(LDPE) blends were prepared by melt blending technique. Dielectric properties such as dielectric constant epsilon' and dissipation factor (tan delta) were measured in the frequency range 4-100 kHz, at different temperature ranging from ambient to 160 degreesC. Effect of LDPE incorporation on dielectric constant and dissipation factor of PP has been observed and discussed. It has been found that the blend had three types of relaxations, namely beta', alpha (c) and ct. These three relaxations have been analyzed. Activation energies determined from the beta', alpha and alpha (c) tan delta -peaks for PP-LDPE blend were 55.2, 70.8 and 87.0 kcal/mole.