The structural and electroactive properties of the as-prepared random copolymer polyvinylidene-co-hexafluoropropylene thin film are explored as a function of thermal treatment at various temperature regions. The thermal treatment of the polymer thin film not only changes the structural conformations that is very natural but establishes a polar domain in the non-polar α-phase. Here, we discover an anomalous temperature-dependent crossover behavior from the non-polar α-phase to an appreciable enhancement in ferroelectric and piezoelectric responses. The maximum unipolar strain , an ultrahigh value of normalized piezoelectric coefficient , high electromechanical coupling factor factor including the high dielectric constant at a relatively low electric field of 900 kV/cm may, therefore, be an effect of the established polar domain for the sample annealed at 105 °C. The direct piezoelectric charge coefficient (d33), a key factor for the performance of a prepared polymer thin film system as an energy harvester, lies in the range of . Also, the annealed sample exhibited a persistent polarization after several cumulative cycles of applied stress.
Influence of annealing temperature on the existence of polar domain in uniaxially stretched polyvinylidene-co-hexafluoropropylene for energy harvesting applications
Note: This paper is part of the Special Topic on Phase-Change Materials: Syntheses, Fundamentals, and Applications.
Rolly Verma, S. K. Rout; Influence of annealing temperature on the existence of polar domain in uniaxially stretched polyvinylidene-co-hexafluoropropylene for energy harvesting applications. J. Appl. Phys. 21 December 2020; 128 (23): 234104. https://doi.org/10.1063/5.0022463
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