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The effect of crystal polymorphism of ferroelectric copolymer vinylidene fluoride‐hexafluoropropylene on its high‐voltage polarization
Author(s) -
Kochervinskii Valentin V.,
Malyshkina Inna A.,
Kiselev Dmitry A.,
Ilina Tatiana S.,
Kozlova Nina V.,
Shmakova Nina A.,
Korlyukov Alexander A.,
Gradova Margaret A.,
Bedin Sergey A.
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49235
Subject(s) - hexafluoropropylene , materials science , ferroelectricity , dielectric , electric field , copolymer , crystallization , coercivity , polarization (electrochemistry) , amorphous solid , polarization density , fluoride , electric displacement field , ferroelectric polymers , condensed matter physics , analytical chemistry (journal) , crystallography , magnetic field , polymer , chemistry , organic chemistry , inorganic chemistry , magnetization , composite material , optoelectronics , physics , piezoelectricity , quantum mechanics , tetrafluoroethylene
Dielectric response of vinylidene fluoride‐hexafluoropropylene copolymer, crystallized in different polymorph modifications, to a high‐voltage electric field was studied. Polarization switching at high electric fields below coercive was detected. It was found that crystallization of the copolymer predominantly in nonpolar α‐phase is accompanied by more intensive growth of electric displacement at polarization. For the sample with higher content of polar γ‐phase, the value of high‐voltage conductivity “anomalously” decreased with increasing field at fields above coercive. The data on the field dependences of the remnant polarization showed that this should be attributed to an increase of the effective capture cross section of deep traps of γ‐phase polar planes for impurity and injected carriers. X‐ray diffraction has revealed the field‐induced transition of a part of the chains of the amorphous phase to the crystal.