Ferro- and piezoelectric properties of flexible ferroelectric and electret films

A new development in the field of flexible ferroelectric and electret films based on PVDF (polyvinylidene fluoride) copolymer and blend-polymer is described, along with its composite film technology. The significance and properties of PVDF, PVDF-PMMA (polymethyl methacrylate), PVDF-PVC (polyvinyl chloride), PVDF/BT, and PVDF-PZT are investigated. Their microstructure analysis and applications are discussed. There exist three possible polarization mechanisms for ferroelectricity and electret in flexible films: beta -crystal type, C-F bond polymer molecular chain with orientation and ordered domain, and spontaneous polarization ferroelectric domain. Ferroelectric composite effects are also present.<
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