Biopolymer Composites With High Dielectric Performance: Interface Engineering
01 Jan 2017-pp 27-128
TL;DR: In this article, the preparation and dielectric behavior of various biopolymer composites is presented, including metal nanoparticles and carbon-based nanofillers such as carbon nanotubes, graphene, etc.
Abstract: In recent years, there is a growing interest in studying the dielectric behavior of biopolymer composites due to their potential application as a dielectric material in various electronic devices such as microchips, transformers, and circuit boards. Conducting electroactive polymer composites have also been investigated for various potential applications which include biological, biomedical, flexible electrodes, display devices, biosensors, and cells for tissue engineering. In this chapter, the preparation and dielectric behavior of various biopolymer composites is presented. These biopolymer composites generally consist of nanoscale metal nanoparticles and carbon-based nanofillers such as carbon nanotubes, graphene, graphene oxide (GO), etc., dispersed into the polymer matrix. The physical and chemical properties of these fillers and their interactions with polymers have a significant effect on the microstructure and the final properties of nanocomposites. The biopolymer composites with excellent dielectric properties show great promise as an energy storage dielectric layer in high-performance capacitor applications such as embedded capacitors. This chapter highlights some of the examples of such biopolymer composites; their processing and dielectric behavior will be discussed in detail.
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References
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TL;DR: In this article, the aging effects of polypyrrole-poly(vinyl alcohol) composites were investigated and a decrease of the conductivity was observed when samples are stored in ambient atmosphere, whereas they are stable in inert environment.
64 citations
TL;DR: In this paper, the change in optical band gap value and room temperature dc conduction behavior of undoped and nano-Ag doped PVA films have been studied and it was found that the value of optical gap has been reduced from 4.92 eV to 3.93 eV on doping 1.32% (by wt.) nanoAg in PVA.
Abstract: Hybrids of nano-Ag and PVA films prepared via sol–gel method have been characterized through XRD, TEM, UV–vis spectroscopy and I – V measurements. The change in optical band gap value and room temperature dc conduction behaviour of undoped and nano-Ag doped PVA films have been studied. The value of optical band gap has been found to be reduced from 4.92 eV (for undoped PVA) to 3.93 eV on doping 1.32% (by wt.) nano-Ag in PVA. This decrease in optical band gap and observed increase in conduction can be correlated to the formation of the charge transfer complexes within the polymer network on dispersing nano-Ag in it. Current–voltage behaviour suggests that Poole–Frenkel mechanism is primarily responsible for the observed conduction for both undoped and nano-Ag doped PVA films.
64 citations
TL;DR: PPy films are applicable as a polymer-modified electrode which support the cell function without collagen which is suggested that PPy supports the secretory function of the chromaffin cells when they are cultured on it.
63 citations
TL;DR: In this paper, the physical, mechanical and dielectric properties of polyurethane-based composite films of bacterial cellulose (10-50-wt) and polyurethene-based resin (polypropylene-based resins) were investigated.
63 citations
TL;DR: In this article, poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) blends (w/w) were prepared in a Brabender (South Hackensack, NJ) plastic order with a thermoplastic mixing chamber (type W60) preheated at 180°C.
Abstract: In this investigation, poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) blends (w/w) were prepared in a Brabender (South Hackensack, NJ) plasticorder with a thermoplastic mixing chamber (type W60) preheated at 180°C These blends were further converted into films by a conventional solution casting method and characterized with Fourier transform infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, mechanical property measurements, impact strength testing, ultraviolet–visible spectroscopy, refractive-index measurements, and contact-angle study The Fourier transform infrared results indicated that the compatibility between these two systems resulted from hydrogen bonding between the carbonyl group of PMMA and the CH2 group of PVDF The thermal analysis showed depressions in the glass-transition temperature, melting temperature, and crystallization temperature The heat of crystallization increased with an increase in the PVDF content in the blend An increase in the heat of crystallization meant an increase in the crystallinity An increase in the cooling rate increased the crystallization rate The improvement in the mechanical properties of the blend films indicated that the observed behavior was ascribable to a more coherent structure of the blends due to strong specific interactions between PMMA and PVDF chains The impact strength analysis revealed a substantial increase in the impact strength from 2164 to 3852 J/m Optical absorption spectra suggested the presence of an optical band gap energy that increased with an increase in the PVDF content in the blend The contact angle against water increased with the PVDF content in the blend film, and this was caused by the hydrophobicity of PVDF due to the CF2 group of PVDF © 2009 Wiley Periodicals, Inc J Appl Polym Sci, 2009
63 citations