On the effects of high loading of ZnO nanofiller on the structural, optical, impedance and dielectric features of PVA@Zn
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On the effects of high loading of ZnO nanofiller on the structural, optical, impedance and dielectric features of PVA@ZnO nanocomposite films A. Muthupandeeswari1 · P. Kalyani1 · L. C. Nehru2 Received: 4 July 2020 / Revised: 19 October 2020 / Accepted: 1 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Unabated interests are being globally expressed on the evaluation of ZnO-filled polyvinyl alcohol (PVA) nanocomposite films because of their prospects in optical, electrical, medical fields, etc. Nevertheless, this communication describes the fabrication of pore-free and freestanding nanocomposite films with PVA matrix and various high loading levels (5, 10 and 15 wt%) of ZnO as a filler by conventional solution-casting method. The filler ZnO powder was custom synthesised by a novel starch-assisted combustion (SAC) method. The films were characterized by various techniques to exemplify interesting modifications on incorporating the ZnO filler synthesized by SAC route. XRD confirms the increasing amorphous propensity of the PVA@ZnO films with increasing filler loading. FTIR implies the development of molecular complex of the polymer with the filler. Conductivity of the composites evaluated from impedance measurements depends on the morphology and amorphousity of the films. Decreasing trend in the real part of dielectric permittivity (Ɛ’) with increasing frequency as well filler loading was obvious. Optical band gap energy decreases with ZnO loading. A high loading of ZnO results in unique morphologies which are hitherto not observed an aspect which may be required for morphology-dependant applications. Therefore, the work evinces that by integrating PVA with high-loaded ZnO yields stable films with impressive conductivity and dielectric property bestowed with unique morphology, thereby revealing prospects in electromagnetic induction (EMI) and microwave absorption and shielding applications further to the known applications like in catalysis, antibacterials, optics and sensors. Keywords PVA@ZnO · Polymer composites · Band gap · A.c. impedance · Dielectric properties
* P. Kalyani [email protected] Extended author information available on the last page of the article
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Polymer Bulletin
Introduction For over three decades, polymeric materials such as thermoplastics and thermosets have made a huge revolution in industries, electronics and optoelectronic devices and more specifically in household utilities [1, 2]. Later advancements in polymer technology have resulted in the most coveted, indispensable and a special class of engineering material namely polymer nanocomposites that has recently attracted a major market in food packing [3] and textile industries, flexible/foldable hand-held electronic gadgets and in very many fields of science, technology and engineering. Particularly, polymer nanocomposites with polyvinyl alcohol (PVA) which is a water-processable polymer [4] is bestowed with several interesting physiochemical features and thus undoubtedly
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