Dielectric relaxation of PVC/PMMA/NiO blends as a function of DC bias
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We have prepared poly vinyl chloride (PVC)/poly-methyl methacrylate (PMMA) blend with loading of Nickel oxide (NiO) by solution cast technique. X-ray diffraction reveals the interaction between NiO, PVC and PMMA in the blend form. The weak interaction between PVC, PMMA and NiO was confirmed by Fourier transform infrared spectroscopy. The miscibility of PVC and PMMA has been confirmed by differential scanning calorimetry. The results demonstrate that the 2 wt% NiO loaded PVC/PMMA blend exhibits lowest crystallinity which leads to better NiO dispersion, also observed by atomic force microscopy and scanning electron microscopy. The performance of electrical properties were evaluated under wide band of frequency (10–107 Hz) as a function of DC bias voltage (0–25 V). The dielectric property was characterized via electrical modulus formalism. The present blend systems show good dielectric property as well as considerable conductivity which differs by frequency and DC bias. The variation of AC conductivity as a function of frequency and DC bias shows plateau shape at higher frequency which obeys Jonscher’s power law. It demonstrates that the AC electrical conductivity is directly proportional to the applied DC bias potential. It may be developed for electrolyte application.
KeywordsAtomic Force Microscopy PMMA Poly Vinyl Chloride Dielectric Relaxation Polymer Blend
The authors would like to thank Naval Research Board, Defense Research and Development Organization (NRB-DRDO), New Delhi for financial support under Project No. 259/Mat./11–12, providing the instrumentation facility for electrical characterization. Authors also thanks to management of VIT University for providing SEM DST-FIST facility.
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