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Review on the properties of the ferrorelaxor polymers and some new recent developments

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Abstract

It has been found that by introducing defects into the P(VDF-TrFE) copolymers, it is possible to convert the polymer from a normal ferroelectric to a relaxor ferroelectric. A new class of ferroelectric polymers, i.e., the terpolymers of P(VDF-TrFE-CFE) or of P(VDF-TrFE-CTFE), was developed from the normal ferroelectric PVDF-TrFE polymer by employing proper defect modifications which eliminate detrimental effects associated with a normal first order F–P transition while maintaining high material responses. Relevant studies show that this class of electroactive polymers offers unique properties in comparison with other ferroelectric polymers. The syntheses of these relaxor ferroelectric polymers have been done by a combination of the suspension polymerization process and an oxygen-activated initiator at a temperature of 40°C. Films from cast solution can be made in different lengths and thicknesses. Stretching of these films increases the performance as well as the mechanical properties. These relaxor-ferroelectric terpolymers P(VDF-TrFE-CFE), P(VDF-TrFE-CTFE) are multifunctional, i.e., electrostrictive material, dielectric for electric energy storage. The terpolymer exhibits high electrostrictive strain (>7%) with relatively high modulus (>0.4 GPa). Examples of devices applications using unimorphe systems are presented. Micropump and Optical device concerning a liquid-filled varifocal lens on a chip are described.

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Acknowledgements

Without the exceptional work and help of Professor Qiming Zhang, this paper could not be written. These new applications of the terpolymer could not be presented too.

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Correspondence to François Bauer.

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Dedicated to Professor Reimund Gerhard.

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Bauer, F. Review on the properties of the ferrorelaxor polymers and some new recent developments. Appl. Phys. A 107, 567–573 (2012). https://doi.org/10.1007/s00339-012-6831-8

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  • DOI: https://doi.org/10.1007/s00339-012-6831-8

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