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Structure and ferroelectric properties of P(VDF-TrFE) films prepared under different conditions - Effect of filtration of the copolymer solution

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Journal of Advanced Dielectrics 2023年第4期13卷 48-51页

作者： b.ploss D.Smykalla S.Engel Department of SciTec University for Applied Sciences Jena07745 JenaGermany Faculty of Chemistry and Earth Sciences Friedrich-Schiller-University Jena07745 JenaGermany

Vinylidene fluoride-trifluoroethylene copolymer films of molar ratio 70/30 with thickness of about 1μm have been deposited from solution in ethyl methyl ketone to a glass substrate with an aluminum electrode by spin *** solution has been filtrated through a PTFE membrane filter with pore size 0.2μm directly before spin coating or it has been used as is(unfiltrated).After deposition of a top electrode,the samples have been polarized by hysteresis loops with an electric field amplitude of about 100 V/μ*** samples,annealed at temperature 145°C for 3 h,a high remanent polarization of about 7.5μC/cm2 has been achieved,without significant differences between samples fabricated of filtrated or unfiltrated *** lamella are growing in films fabricated of filtrated solution when they are heated above the melting temperature to 159°C for 3 min before the further annealing process at 145°*** films show substantially lower remanent polarization below 4μC/*** images recorded with a pyroelectric laser scanning microscope show that the spherulites have very small pyroelectric activity,i.e.,the spherulites consist of flat-on *** contrast,no spherulitic lamella are growing in films fabricated of unfiltrated solution heated above the melting temperature,melted and annealed under the same *** explanation for this observation is that filtrating changes the structure of the copolymer in solution from polymer coil to *** rods deposited on a substrate will crystallize in flat-on lamella when heated above the melting temperature,in contrast to copolymer coils which crystallize in edge-on lamella.

关键词： P(VDF-TrFE) ferroelectric polymer structure

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