Improved Electroactive β Phase Nucleation and Dielectric Properties of P(VDF-HFP) Composite with Al(NO3)3·9H2O Fillers

Abstract

In this study, the poly (vinylidene fluoride-hexafluoropropylene) P(VDF-HFP) film is facilely prepared by the solution casting technique. The effect of aluminum nitrate nonahydrate (Al(NO3)3·9H2O) on the crystalline phase and dielectric behavior of P(VDF-HFP) composite films is systematically investigated. Experimental results founded that the P(VDF-HFP) composite films exhibit the micro-pores structure on the top surface. Addition of the Al(NO3)3·9H2O filler is found to enhance the electroactive β phase by about 20%. Furthermore, the dielectric constants of pure P(VDF-HFP) and P(VDF-HFP)/1.5 wt.% Al(NO3)3·9H2O films are derived as 8 and 28, respectively. These results indicate that the Al(NO3)3·9H2O hydrated salt acts as the nucleation agent to produce the crystallization of the β phase resulted in improved dielectric constant in P(VDF-HFP) composite films.