Investigation of electrical and thermal properties of poly (vinylidene fluoride)/strontium hexaferrite polymer composite
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Investigation of electrical and thermal properties of poly (vinylidene fluoride)/strontium hexaferrite polymer composites Deeptimayee Khatua1, Minakshi Padhy1, Rajesh K. Singh2, R. N. P. Choudhary3, and P. Ganga Raju Achary1,* 1
Department of Chemistry, Siksha ‘O’ Anusandhan, Deemed to be University, Khandagiri Square, Bhubaneswar, India P.G. Department of Chemistry, North Orissa University, Takatpur, Orissa 757003, India 3 Department of Physics, Siksha ‘O’ Anusandhan, Deemed to be University, Khandagiri Square, Bhubaneswar, India 2
Received: 23 June 2020
ABSTRACT
Accepted: 29 October 2020
In the present communication polyvinylidene fluoride (PVDF)/strontium hexaferrite (SHF) composite films were fabricated by the solution casting technique, taking 0 wt%, 5 wt%, 7.5 wt%, and 10 wt% of SHF particles. The inorganic phase SHF was synthesized by the sol–gel auto combustion technique using urea as fuel and ethylene glycol as a surface directing agent. XRD and Rietveld analysis confirmed the formation of the SHF particles. The existence of a, b, and c crystalline phases of PVDF in PVDF/SHF composite was analyzed by the FTIR investigation. The optical study did not show any appreciable change in the absorption due to the incorporation of the SHF particles in the PVDF matrix. The incorporation of the SHF particles in the matrix increases the electroactive bphase as well as the thermal stability of the composites. The kinetics of thermal degradation of the PVDF/SHF composites were carried out by the Coats–Redfern method, taking the experimental thermal data (TGA). The kinetic parameters of the degradation process such as order of reaction, Arrhenius constant, and the activation energy (Ea) were also reported. Electrical and dielectric characteristics were carried out in the frequency range of 100 Hz–1 MHz. The dielectric permittivity of the PVDF/SHF composite increased up to 7.5 wt% of SHF.
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Springer Science+Business
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1 Introduction The poly (vinylidene fluoride) (PVDF) is well-known for its excellent ferroelectric property. Today, the research, fabrication, and exploration of the
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https://doi.org/10.1007/s10854-020-04794-6
applicability of PVDF based materials are attracting many materials scientists around the globe, the voluminous publications on PVDF justify the prime importance of it. The PVDF based materials possess some unique and much—required properties like
J Mater Sci: Mater Electron
flexible, thermally stable, transparent, low dielectric loss, high dielectric constant, better electrochemical performance. Not only that, PVDF based materials are economical, biocompatible and can be processed easily by several known techniques [1–3]. Different crystalline phases of PVDF are a, b, c, and d-phase, the fluoropolymer (PVDF) can have different confirmations, and few conformations are electro active due to the carbon–fluorine (C–F) bond dipoles. The aphase (TGTG0 conformation) is not polar, however the d-phase is
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