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Polymers
Volume 15
Issue 3
10.3390/polym15030595
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Article

Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)-grafted-BaTiO3 Nanocomposites

by
Fatima Ezzahra Bouharras
1,2,3,
Massimiliano Labardi
4,*,
Elpidio Tombari
4,
Simone Capaccioli
2,4,5,
Mustapha Raihane
1,* and
Bruno Améduri
3
1
IMED-Lab, Faculty of Sciences and Techniques, Cadi-Ayyad University, Av. Abdelkrim Khattabi, BP 549, Marrakesh 40000, Morocco
2
Physics Department, University of Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy
3
ICGM, University of Montpellier, CNRS, ENSCM, 34095 Montpellier, France
4
CNR-IPCF, Pisa Unit, Physics Department, University of Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy
5
CISUP, Centro per l’Integrazione della Strumentazione dell’Università di Pisa, 56126 Pisa, Italy
*
Authors to whom correspondence should be addressed.
Polymers 2023, 15(3), 595; https://doi.org/10.3390/polym15030595
Submission received: 7 December 2022 / Revised: 26 December 2022 / Accepted: 16 January 2023 / Published: 24 January 2023
(This article belongs to the Special Issue Processing and Characterization of Polymeric Composites)
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Abstract

Dielectric properties of poly(vinylidene fluoride)-grafted-BaTiO3 (PVDF-g-BT) core-shell structured nanocomposites obtained from Reversible Addition Fragmentation chain Transfer (RAFT) polymerization of VDF were investigated by Broadband Dielectric Spectroscopy (BDS). The dielectric constant increased along with the BT content, about +50% by addition of 15 vol% of BT, which was around 40% more than expected from predictions using the usual dielectric modeling methods for composite materials, to be ascribed to the effect of the interfacial core-shell structure. The known dielectric relaxations for PVDF were observed for the neat polymer as well as for its nanocomposites, not affected by the presence of nanoparticles. A relaxation process at higher temperatures was found, due to interfacial polarization at the amorphous-crystalline interface, due to the high crystallinity of materials produced by RAFT. Isochronal BDS spectra were exploited to detect the primary relaxation of the amorphous fraction. Thermal analysis demonstrated a very broad endotherm at temperatures much lower than the usual melting peaks, possibly due to the ungrafted fraction of the polymer that is more easily removable by repeated washing of the pristine material with acetone.
Keywords: broadband dielectric spectroscopy; barium titanate nanoparticle; Poly(vinylidene fluoride); core-shell; RAFT polymerization; interfacial polarization broadband dielectric spectroscopy; barium titanate nanoparticle; Poly(vinylidene fluoride); core-shell; RAFT polymerization; interfacial polarization

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MDPI and ACS Style

Bouharras, F.E.; Labardi, M.; Tombari, E.; Capaccioli, S.; Raihane, M.; Améduri, B. Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)-grafted-BaTiO3 Nanocomposites. Polymers 2023, 15, 595. https://doi.org/10.3390/polym15030595

AMA Style

Bouharras FE, Labardi M, Tombari E, Capaccioli S, Raihane M, Améduri B. Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)-grafted-BaTiO3 Nanocomposites. Polymers. 2023; 15(3):595. https://doi.org/10.3390/polym15030595

Chicago/Turabian Style

Bouharras, Fatima Ezzahra, Massimiliano Labardi, Elpidio Tombari, Simone Capaccioli, Mustapha Raihane, and Bruno Améduri. 2023. "Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)-grafted-BaTiO3 Nanocomposites" Polymers 15, no. 3: 595. https://doi.org/10.3390/polym15030595

APA Style

Bouharras, F. E., Labardi, M., Tombari, E., Capaccioli, S., Raihane, M., & Améduri, B. (2023). Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)-grafted-BaTiO3 Nanocomposites. Polymers, 15(3), 595. https://doi.org/10.3390/polym15030595

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