Polyvinylidene fluoride (PVDF) and poly methyl methacrylate (PMMA) polymer blends were prepared by loading optimized quantity of attapulgite clay (AT) and hexagonal boron nitride (h-BN) nanopowder admixture. The crystalline phases were confirmed by X-ray diffraction patterns owing to the crystallinity of PVDF and h-BN. The shape and dimension of AT and h-BN fillers were confirmed by transmission electron microscope. The morphological changes were confirmed by scanning electron microscope, and the chemical composition of elements in the blends was confirmed by energy-dispersive spectroscopy. Frequency-dependent dielectric properties of the mixtures were explored as a function of temperature. The dielectric constant (εr) was improved (~ 6.87) when the AT and h-BN were loaded in an equal ratio (5:5 wt%). A low dissipation factor (tan δ) was obtained (~ 0.2) for the optimized loadings of AT and h-BN. Thermal stability of the blends was studied, and a delay in the degradation process at various steps was studied for AT/h-BN-incorporated PVDF/PMMA blends. The overall results suggest that the optimized loading of AT and h-BN significantly improved the dielectric and thermal properties of the PVDF/PMMA blends.
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The authors would like to thank Dr. Girish M. Joshi (Institute of Chemical Technology, Jalna, India) for providing dielectric characterization and Mr. P. Parthiban (University of Hyderabad) for providing optical surface profiler technique.
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Dhanumalayan, E., Kaleemulla, S. Enhanced structure, dielectric, and thermal properties of attapulgite clay and hexagonal boron nitride admixture loaded polymer blends. J Mater Sci: Mater Electron 31, 17828–17842 (2020). https://doi.org/10.1007/s10854-020-04337-z