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Improved dielectric properties of poly(vinylidene fluoride)– BaTiO 3 composites by solvent‐free processing
Author(s) -
Brunengo Elisabetta,
Conzatti Lucia,
Schizzi Ilaria,
Buscaglia Maria Teresa,
Canu Giovanna,
Curecheriu Lavinia,
Costa Chiara,
Castellano Maila,
Mitoseriu Liliana,
Stagnaro Paola,
Buscaglia Vincenzo
Publication year - 2021
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.50049
Subject(s) - materials science , composite material , dielectric , fluoride , nanoparticle , compression molding , crystallization , barium titanate , permittivity , solvent , chemical engineering , ceramic , organic chemistry , nanotechnology , inorganic chemistry , chemistry , optoelectronics , mold , engineering
Abstract Composites of poly(vinylidene fluoride) (PVDF) and BaTiO 3 nanoparticles (average diameter ca. 125 nm) are fabricated by a solvent‐free and industrially scalable technique, that is, melt blending, followed by compression molding. The effect of processing parameters on the spectroscopic, microstructural, thermal, mechanical and dielectric properties are evaluated as a function of composition (loading up to 30 vol%). The presence of nanoparticle inclusions as well as specific compression molding parameters demonstrate both to affect the molecular relaxations of the PVDF matrix, studied by correlating the results of different techniques, and to induce the PVDF crystallization as β phase. Processing parameters also play a key role for optimizing the dielectric properties. An improved dielectric behavior of the composites is obtained in terms of both permittivity, whose value increases up to four times that of neat PVDF, and dielectric losses, lower than 5% between 10 and 3·10 4 Hz. The obtained performances resulted enhanced compared to analogous composites prepared with the use of solvents.