Synthesis and characterization of multifunctional ZnBr₂/PVA polymer dielectrics

Abstract

Different weight percentage of ZnBr 2 doped poly(vinyl alcohol) (PVA) free standing composite films were prepared using solution casting method. These films were characterized for analyzing structural, dielectric, electrochemical properties. This paper mainly focused to understand the contribution of physical phenomenon on conductivity in terms of dielectric parameters. FTIR spectrum confirms the interaction between ZnBr 2 and PVA. Pseudo-capacitive behavior observed from cyclic voltammograms. Dielectric properties of the composites follow non-Debye type behavior. The conducting phenomenon occurs due to hopping of ions between coordination sites present in the composite and the segmental relaxation of polymer chain.

Optical and Dielectric Features of PVA/CMC/PVP/ZnMn2O4/CuCo2O4/x wt% MWCNTs Blended Polymers for Optoelectronic Applications

“…This behavior is associated with the absence of the restorative force that governs the motion of charge carriers when an induced electric field is present. 65,66 When a long-range motion is restricted, a relaxation process takes place, which results in the development of peaks in M″ curves, Fig. 11b.…”

“…The dispersion data suggests that all blends demonstrate non-Debye relaxation behavior, implying that mobile ions have different relaxation times. 66,67 The peak intensity exhibited variability based on the types of fillers, leading to a modification in the capacitance of the various blends. 68 Complex impedance of blended polymers.-Figure 12 displays the Nyquist plot, which represents the relationship between the real part (Z') and the imaginary part (Z') of the PVA/CMC/PVP/ZnMn 2 O 4 /CuCo 2 O 4 /x wt% MWCNTs blended polymers.…”

High -k Green Polymer Nano composites Based on Polyvinyl Alcohol for Electrostatic Dissipation Applications

“…The increase in  with increasing BaTiO3 loading is related to the fact that microcapacitors are constructed by particles near to each other and ultra-thin PVA separated in the centre under electric field [31][32][33]. Both  and  decreases by increasing f, this is because of fact that the dipoles of composite molecules are not capable to rotate parallel with respect to speedy periodic phase turnaround of electric field and the result is time lag between the frequency of dipole and that of electric field [34], this finding means that there is no ion dissemination and charge build up. As seen in Figure (6), the  of the NCPs reduced fast at low f values and subsequently increased somewhat at high f as the testing frequency increased.…”

Synthesis of (Poly-methyl Methacrylate-lead Oxide) Nanocomposites and Studying their A.C Electrical Properties for Piezoelectric Applications

“…Where, D: is dispersion factor of nanocomposites The A.C electrical conductivity of (PMMA-PbO 2 ) nanocomposites is determined by the following (3) [7]:…”