Influence of Metastable States on Electrophysical Properties in Ferroelectric Crystalline Polymers

Abstract:

The poling and local piezoresponse mechanism has been investigated in ferroelectric polymers. Isotropic 94/6 composition vinylidenefluoride and tetraflouroethylene copolymer films is formed from acetone at room temperature by slow evaporation of solvent. The copolymer crystallization results in metastability (nonequilibre) form at high overcooling temperatures. IR spectroscopy shows occurrence of isomers with conformation TGTG^-, T₃GT₃G^- and (TT)_n. The local piezoresponse shows that ferroelectric domains include crystals areas as well as nonordered phase. After annealing by heating to 150 oC was found conformation changes in polymer chain: T₃GT₃G^- TGTG^- and T₃GT₃G^- (TT)_n. It is show that the regular conformation chains length rising after annealing. Polarization value decreasing kinetic was investigated by piezoresponse force microscopy method.

• Periodical: Key Engineering Materials (Volume 605)
• Pages: 499-502
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.605.499
• Online since: April 2014
• Authors: V.V. Kochervinskii*, A. Pavlov, N. Kozlova, N. Shmakova, D.A. Kiselev, M.D. Malinkovich
• Keywords: Copolymer, Piezoresponse Force Microscopy, Poling Process, Relaxation Dynamics

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