Study of Some Influencing Factors on the Dielectric Strength of (Blend PZT) Nanocomposites Piezoelectric

The aim of this research is to study the affecting factors on the dielectric strength of polymeric blend [of Epoxy resin and unsaturated polyester] and its composites. A Nano composites were prepared based on polymeric blend ( 80% Ep + 20% UPE), supported by Nano Piezoelectric powder (PZT), of crystalline size (1-10 nm) with weight percentages (2, 4 and 6 Wt%). Dielectric strength (Ebr) for the blend and composite samples was studied before and after immersion in water for 11 weeks. The results showed that (Ebr) decreases with average the rise of voltage decreasing, increasing the thickness of samples and by form nonlinearly (35.13 kv/s – 19.38 kV/s), and with the number of cycles While (Ebr) increases with increasing the addition of ratio (36.77 kV/s – 43.82 kV/s ). On the other hand, immersing the samples in the water caused a clear reduction of the dielectric strength for each of the blend and composites.