The Mechanism of Thermo-Induced Electrostatic Image Formation in Poled Ferroelectric Polymer Films.
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Ferroelectric polymer films have been shown to be useful for heat-mode electrostatic image recording. In connection with this novel imaging process, changes of state at heating were investigated on a copolymer of vinylidene fluoride and tetrafluoroethylene. First, an attempt to estimate the degree of polarization from the analysis of corona charging curves of films partially depolarized with heat pulses is described. For films exposed to a flash light ( 50 mJ/cm<SUP>2</SUP>, 10 ms), dipoles were estimated to be disordered by about 20%. This magnitude seems to be insufficient for explaining the observed electrostatic contrast. Another heating effect likely responsible for image formation was found. When poled films were subjected to heat pulse, they were charged up to 40 to 60 V with a polarity opposite that employed for poling. This can be attributed to a combined effect of pyroelectricity and leakage of surface charges.
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公益社団法人 応用物理学会 | 論文
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