Abstract
After annealing the solution cast P(VDF-TrFE) films at elevated temperatures, which were synthesized via a full hydrogenation process from P(VDF-CTFE) with a composition of VDF/TrFE = 80/20 (mol%), a series of P(VDF-TrFE) films were fabricated in present work. The crystalline and ferroelectric phases of the films were carefully characterized and their dielectric, ferroelectric and piezoelectric properties were systematically investigated. The improved crystalline and ferroelectric phases in the films induced by annealing at elevated temperatures are responsible for the significant improved electric properties of the films. The optimized annealing temperature is found to be 130 °C and the best performance including the highest dielectric constant of 12.5 at 1 kHz, the largest maximum polarization of 11.21 μC/cm2 and remnant polarization of 7.22 μC/cm2, the lowest coercive electric field of 56 MV/m, and the highest piezoelectric coefficient of -25 pC/N is observed.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51103115, 50903065 and 51573146), Fundamental Research Funds for the Central Universities (Nos. XJJ2013075 and cxtd2015003), International Science & Technology Cooperation Program of China (No. 2013DFR50470), Natural Science Basic Research Plan in Shaanxi Province of China (Nos. 2013JZ003 and 2015JZ009), and National Basic Research Program of China 973 (No. 6132620101).
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Wang, J., Li, Z., Yan, Y. et al. Improving ferro- and piezo- electric properties of hydrogenized poly(vinylidene fluoride-trifluoroethylene) films by annealing at elevated temperatures. Chin J Polym Sci 34, 649–658 (2016). https://doi.org/10.1007/s10118-016-1782-8
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DOI: https://doi.org/10.1007/s10118-016-1782-8