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Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)- grafted-BaTiO 3 Nanocomposites. Polymers (Basel) 2023; 15:polym15030595. [PMID: 36771897 PMCID: PMC9919282 DOI: 10.3390/polym15030595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 12/26/2022] [Accepted: 01/16/2023] [Indexed: 01/26/2023] Open
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.
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Nieto Simavilla D, Abate AA, Liu J, Geerts YH, Losada-Peréz P, Napolitano S. 1D-Confinement Inhibits the Anomaly in Secondary Relaxation of a Fluorinated Polymer. ACS Macro Lett 2021; 10:649-653. [PMID: 35570757 DOI: 10.1021/acsmacrolett.1c00220] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present an experimental study of the dynamics of a well-pronounced secondary relaxation observed in bulk and ultrathin films of the fluorinated copolymer poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP). In proximity to the glass transition, an anomalous phenomenon is observed: the β-relaxation slows down upon heating. Measurements as a function of the film thickness show that this exceptional behavior gradually vanishes upon confinement at the nanoscale level. Regardless of sample size, the relaxation dynamics could be described in terms of the Minimal Model via an asymmetric double well potential. Supported by a structural investigation of surfaces and interfaces, our results reveal that the presence of adsorbing walls induces an increase in glass transition temperature, which counterbalances the asymmetry in the double well potential responsible for molecular motion.
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Affiliation(s)
- David Nieto Simavilla
- Laboratory of Polymer and Soft Matter Dynamics, Experimental Soft Matter and Thermal Physics (EST), Université libre de Bruxelles (ULB), Bruxelles 1050, Belgium
| | - Anabella A Abate
- Laboratory of Polymer and Soft Matter Dynamics, Experimental Soft Matter and Thermal Physics (EST), Université libre de Bruxelles (ULB), Bruxelles 1050, Belgium
| | - Jie Liu
- Laboratoire de Chimie des Polyméres, Université Libre de Bruxelles (ULB), 1050 Bruxelles, Belgium
| | - Yves H Geerts
- Laboratoire de Chimie des Polyméres, Université Libre de Bruxelles (ULB), 1050 Bruxelles, Belgium.,International Solvay Institutes of Physics and Chemistry, ULB - Campus Plaine - CP 231, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - Patricia Losada-Peréz
- Experimental Soft Matter and Thermal Physics (EST), Université Libre de Bruxelles (ULB), Bruxelles 1050, Belgium
| | - Simone Napolitano
- Laboratory of Polymer and Soft Matter Dynamics, Experimental Soft Matter and Thermal Physics (EST), Université libre de Bruxelles (ULB), Bruxelles 1050, Belgium
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Kochervinskii VV, Malyshkina IA, Gradova MA, Kozlova NV, Shmakova NA, Buzin MI, Korlyukov AA, Bedin SA. On the features of cooperative mobility in the amorphous phase of ferroelectric polymers. Colloid Polym Sci 2019. [DOI: 10.1007/s00396-019-04478-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kochervinskii VV, Kiselev DA, Malinkovich MD, Shmakova NA. An effect of the film texture on high-voltage polarization and local piezoelectric properties of the ferroelectric copolymer of vinylidene fluoride. Colloid Polym Sci 2018. [DOI: 10.1007/s00396-018-4317-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kochervinskii VV, Bedin SA, Razumovskaya IV, Shcherbina MA, Buzin MI, Malyshkina IA, Prazdnichnyi AM, Pavlov AS, Vasilevskii OI. Molecular mobility and structuring in textured films of the ferroelectric copolymer of vinylidene fluoride with tetrafluoroethylene. POLYMER SCIENCE SERIES A 2016. [DOI: 10.1134/s0965545x1603010x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Gadinski MR, Han K, Li Q, Zhang G, Reainthippayasakul W, Wang Q. High energy density and breakdown strength from β and γ phases in poly(vinylidene fluoride-co-bromotrifluoroethylene) copolymers. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18981-18988. [PMID: 25319108 DOI: 10.1021/am504874f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Poly(vinylidene fluoride) PVDF-based copolymers represent the state of the art dielectric polymers for high energy density capacitors. Past work on these copolymers has been done with limited emphasis on the effects of copolymer composition and with a limited range of defect monomers, focusing primarily on the commercially available poly(vinylidene fluoride-co-chlorotrifluoroethylene), P(VDF-CTFE), and poly(vinylidene fluoride-co-hexafluoropropylene), P(VDF-HFP), and the processing thereof. To expand on this area of research, copolymers of VDF and bromotrifluoroethylene (BTFE) were synthesized examining the composition range where uniaxial stretching was possible. It is found that P(VDF-BTFE) copolymers with small BTFE contents (< 2 mol %) stabilize the γ phase, compared to P(VDF-CTFE)s and P(VDF-HFP)s that are largely α phase in composition. Furthermore, different from P(VDF-CTFE)s and P(VDF-HFP)s, whose energy storage capabilities depend on the reversibility of the α to β phases transformation, high discharged energy densities (i.e., 20.8 J/cm(3) at 716 MV/m) are also achievable through the β and γ phases in P(VDF-BTFE)s without significantly reducing crystallinity and breakdown strength. This study demonstrates new avenues to the development of high energy density ferroelectric copolymers via manipulation of the γ phase through variation of the structure and content of comonomers.
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Affiliation(s)
- Matthew R Gadinski
- Department of Materials Science and Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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Kochervinskii VV, Pavlov AS, Kozlova NV, Shmakova NA. Polarization of block textured films of ferroelectric copolymers of vinylidene fluoride with tetrafluoroethylene in an external field. POLYMER SCIENCE SERIES A 2014. [DOI: 10.1134/s0965545x14050101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kochervinskii VV, Kiselev DA, Malinkovich MD, Pavlov AS, Kozlova NV, Shmakova NA. Effect of the structure of a ferroelectric vinylidene fluoride-tetrafluoroethylene copolymer on the characteristics of a local piezoelectric response. POLYMER SCIENCE SERIES A 2014. [DOI: 10.1134/s0965545x14010064] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Gadinski MR, Chanthad C, Han K, Dong L, Wang Q. Synthesis of poly(vinylidene fluoride-co-bromotrifluoroethylene) and effects of molecular defects on microstructure and dielectric properties. Polym Chem 2014. [DOI: 10.1039/c4py00690a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copolymers of vinylidene fluoride and bromotrifluoroethylene were synthesized with varying concentrations with the effect of molecular defects on microstructure evaluated.
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Affiliation(s)
- Matthew R. Gadinski
- Department of Material Science and Engineering
- The Pennsylvania State University
- University Park
- Pennsylvania 16802, USA
| | - Chalatorn Chanthad
- Department of Material Science and Engineering
- The Pennsylvania State University
- University Park
- Pennsylvania 16802, USA
| | - Kuo Han
- Department of Material Science and Engineering
- The Pennsylvania State University
- University Park
- Pennsylvania 16802, USA
| | - Lijie Dong
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- and School of Materials Science and Engineering
- Wuhan University of Technology
- Wuhan 430070, People's Republic of China
| | - Qing Wang
- Department of Material Science and Engineering
- The Pennsylvania State University
- University Park
- Pennsylvania 16802, USA
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Kochervinskii VV, Chubunova EV, Lebedinskii YY, Shmakova NA. Effect of electrode material on contact high-voltage polarization in a vinylidene fluoride-hexafluoropropylene copolymer. POLYMER SCIENCE SERIES A 2011. [DOI: 10.1134/s0965545x11100051] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Electrospun PVDF/BaTiO3 nanocomposites: polymorphism and thermal emissivity studies. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s12588-011-9001-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kochervinskij VV, Malyshkina IA, Bessonova NP, Suljanov SN, Dembo KA. Effect of recrystallization on the molecular mobility of a copolymer of vinylidene fluoride and hexafluoropropylene. J Appl Polym Sci 2010. [DOI: 10.1002/app.32993] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kelarakis A, Hayrapetyan S, Ansari S, Fang J, Estevez L, Giannelis EP. Clay nanocomposites based on poly(vinylidene fluoride-co-hexafluoropropylene): Structure and properties. POLYMER 2010. [DOI: 10.1016/j.polymer.2009.11.057] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kochervinskii VV, Kozlova NV, Khnykov AY, Shcherbina MA, Sulyanov SN, Dembo KA. Features of structure formation and electrophysical properties of poly(vinylidene fluoride) crystalline ferroelectric polymers. J Appl Polym Sci 2009. [DOI: 10.1002/app.31044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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