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Curie transition and piezoelectricity of the blends of a ferroelectric VDF/TrFE copolymer and PMMA
Author(s) -
Kim Kap Jin,
Kim Gwan Bum
Publication year - 1993
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.1993.070471008
Subject(s) - curie temperature , ferroelectricity , materials science , phase transition , copolymer , crystallization , intermolecular force , dielectric , phase (matter) , curie , piezoelectricity , polymer chemistry , condensed matter physics , thermodynamics , composite material , organic chemistry , polymer , chemistry , ferromagnetism , physics , molecule , optoelectronics
The Curie transition, even though the conformational change at the Curie transition primarily arises from intermolecular interaction, is highly dependent on the crystallization conditions. A slower cooling rate from the melt during paraelectric crystallization lowers T c , increases the portion of F β at the expense of F α reduction, and produces a more unstable ferroelectric phase. T ↓ cis rarely dependent upon the amount of PMMA, but T ↑ cis increased with the PMMA content. PMMA has a favorable action in forming a more stable ferroelectric phase in the P(VDF/TrFE)/PMMA blend and elevating the Curie transition point because of the all‐ trans sequence conformation of PMMA and a specific intermolecular interaction with P(VDF/TrFE) in the melt state. However, PMMA reduces the total amount of the crystalline phase, the electric response, and the piezoelectricity. © 1993 John Wiley & Sons, Inc.