Effect of BaTiO 3 Filler Modification with Multiwalled Carbon Nanotubes on Electric Properties of Polymer Nanocomposites.

Autor:	Sychov M; Department of Theoretical Fundamentals of Materials Science, Saint-Petersburg State Institute of Technology, 190013 St. Petersburg, Russia.; Institute of Silicate Chemistry of NRC 'Kurchatov Institute', 191015 St. Petersburg, Russia., Guan X; Department of Theoretical Fundamentals of Materials Science, Saint-Petersburg State Institute of Technology, 190013 St. Petersburg, Russia.; Department of Materials Science, Guiyang University, Guiyang 550005, China., Mjakin S; Department of Theoretical Fundamentals of Materials Science, Saint-Petersburg State Institute of Technology, 190013 St. Petersburg, Russia., Boridko L; Department of Theoretical Fundamentals of Materials Science, Saint-Petersburg State Institute of Technology, 190013 St. Petersburg, Russia., Khristyuk N; Department of Theoretical Fundamentals of Materials Science, Saint-Petersburg State Institute of Technology, 190013 St. Petersburg, Russia.; National Research Center 'Kurchatov Institute', Central Research Institute of Structural Materials 'Prometey', 191015 St. Petersburg, Russia., Gravit M; Higher School of Industrial, Civil and Road Engineering, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia., Diachenko S; Department of Theoretical Fundamentals of Materials Science, Saint-Petersburg State Institute of Technology, 190013 St. Petersburg, Russia.
Jazyk:	angličtina
Zdroj:	Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2024 Jul 22; Vol. 14 (14). Date of Electronic Publication: 2024 Jul 22.
DOI:	10.3390/nano14141232
Abstrakt:	Two ranges of dielectric permittivity ( k ) increase in polymer composites upon the modification of BaTiO 3 filler with multiwalled carbon nanotubes (MWCNTs) are shown for the first time. The first increase in permittivity is observed at low MWCNT content in the composite (approximately 0.07 vol.%) without a considerable increase in dielectric loss tangent and electrical conductivity. This effect is determined by the intensification of filler-polymer interactions caused by the nanotubes, which introduce Brønsted acidic centers on the modified filler surface and thus promote interactions with the cyanoethyl ester of polyvinyl alcohol (CEPVA) polymer binder. Consequently, the structure of the composites becomes more uniform: the permittivity increase is accompanied by a decrease in the lacunarity (nonuniformity) of the structure and an increase in scale invariance, which characterizes the self-similarity of the composite structure. The permittivity of the composites in the first range follows a modified Lichtenecker equation, including the content of Brønsted acidic centers as a parameter. The second permittivity growth range features a drastic increase in the dielectric loss tangent and conductivity corresponding to the percolation effect with the threshold at 0.3 vol.% of MWCNTs.
Databáze:	MEDLINE
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