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- W2218224960 abstract "Ferroelectric, pyroelectric and dielectric properties were investigated for Form IV poly(vinylidene fluoride) (PVDF). We fabricated highly crystalline Form II thin films by spin-casting from acetone or methyl ethyl ketone followed by annealing at 155 °C and then converted into Form IV using a high electric field of 500 MV/m. We observed displacement (D) - electric field (E) hysteresis loop and attendant pyroelectric activity that supported ferroelectric polarization reversal in Form IV PVDF. The highly rounded D-E loop with a coercive field of 240 MV/m suggests that reversal of the dipole component perpendicular to TGTG¯ chain requires very high field and progresses based on step-by-step switching of respective molecules. We also observed similar crystalline relaxations in Form II and IV suggesting that fluctuations of parallel dipoles in TGTG¯ chains were not affected by chain packing. Simultaneous observation of polarization reversal and dielectric relaxation associated with two orthogonal directions (a- and c-axis) of crystallites is interpreted using the tilt angle between of the chain axis and sample surface. Microscopic features are discussed in terms of electric-field-induced and thermally-induced changes in TGTG¯ conformational sequences." @default.
- W2218224960 created "2016-06-24" @default.
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- W2218224960 date "2016-01-01" @default.
- W2218224960 modified "2023-09-30" @default.
- W2218224960 title "Ferroelectric polarization, pyroelectric activity and dielectric relaxation in Form IV poly(vinylidene fluoride)" @default.
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- W2218224960 doi "https://doi.org/10.1016/j.polymer.2015.11.024" @default.
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