Sono-synthesis of polystyrene/alumina nanocomposites:
01 Dec 2012-Vol. 226, Iss: 4, pp 157-164
TL;DR: In this paper, the preparation of nanocomposites by the usage of ultrasound was focused on synthesizing polystyrene/alumina composites using commercial alumina nanoparticles of approximately 200 nm size.
Abstract: Polymer nanocomposites offer remarkable enhancement in properties compared to pristine polymers, and also compared to conventional micro- and macro-composites. The present study is focused on the preparation of nanocomposites by the usage of ultrasound. Polystyrene/alumina nanocomposites were synthesized using commercial alumina nanoparticles of approximately 200 nm size. These particles were dispersed in polystyrene solution by subjecting to ultrasound. Composites were synthesized at different filler loadings varying from 0.2% to 1% by weight. Dispersion characterization of these composites was carried out using scanning electron microscopy and X-ray diffraction. X-ray diffraction data revealed the incorporation of the filler into the polymer matrix. The mechanical properties, mainly tensile and impact properties, of the composites were studied to analyse the effect of nanofillers on the enhancement in functional properties compared to the neat polymer. Tensile strength and modulus varied with the filler...
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Patent•
21 Oct 1991
TL;DR: In this paper, a method and a material of a three-dimensional molded body of the composite a balkchenartiges each other in communication system encloses cavity, the material is producible that a scaffold is created by serving as a placeholder molded articles are prepared from which the moldings removed and which is filled subsequently by a casting and sprayable form mass.
Abstract: The invention relates to a method and a material of a three-dimensional molded body of the composite a balkchenartiges each other in communication system encloses cavity. The material is producible that a scaffold is created by serving as a placeholder molded articles are prepared from which the moldings removed and which is filled subsequently by a casting and sprayable form mass, it can be removed by dissolving and melting after its hardening can.
27 citations
01 Jun 2014
TL;DR: In this article, the effect of frequency on filler dispersion in the polymer matrix was studied by SEM analysis and functional property enhancement of the composite material was found to be better at low filler loadings as compared with neat polymer and also with composites prepared without ultrasound.
Abstract: Polymer nanocomposites are advanced nanomaterials which exhibit dramatic improvements in various mechanical, thermal and barrier properties as compared with the neat polymer. Polystyrene/ alumina nanocomposites were prepared by an ultrasound-assisted solution casting method at filler loadings ranging from 0.2 to 2% and also at different ultrasonic frequencies, viz. 58 kHz, 192/58 kHz, 430 kHz, 470 kHz and 1 MHz. The composites were subjected to mechanical property tests (tensile and impact tests) and cavitation erosion tests to study the enhancement in functional properties. Filler dispersion in the polymer matrix was observed by SEM analysis. The effect of frequency on filler dispersion in the matrix was studied by SEM analysis and functional property enhancement of the composite material. The composites prepared at dual (high/ low) frequency (192/58 kHz) were found to show better property enhancement at low filler loadings as compared with neat polymer and also with composites prepared without ultrasound, thus reinforcing the finding that ultrasound-assisted synthesis is a promising method for the synthesis of nanocomposites.
7 citations
Cites background or result from "Sono-synthesis of polystyrene/alumi..."
...An explorative study (Philip et al. 2012) had earlier been published by the authors on sonosynthesis of polystyrene/alumina nanocomposites....
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...The data for impact strength, tensile modulus, and cavitation erosion for composites prepared at frequencies 430 kHz and 192/58 kHz (dual frequency) have been published in a previous study (Philip et al. 2012)....
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TL;DR: In this article, the authors focused on the TiO2/Al2O3 powders synthesized by the sol-gel at low vacuum atmosphere, incorporated to polycaprolactone polymer.
3 citations
References
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TL;DR: In this paper, the comminution of unagglomerated alumina powders was enhanced by applying ultrasonic energy during wet-ball milling for 16 h. The resulting powders had significantly finer mean and median particle sizes, narrower particle-size distributions, and less angular morphologies than powders which were conventionally wetball milled.
7 citations
TL;DR: In this article, Alumina flakes were prepared by solution combustion method and milled to provide powder, then the powders were dispersed in polystyrene (PS) and poly methyl methacrylate (PMMA) matrixes and thin sheets of composites were produced by solution method.
Abstract: Alumina flakes were prepared by solution combustion method and milled to provide powder. XRD and SEM data exhibited microsized flakes with 100 nm thickness and nanosized grains. Then the powders were dispersed in polystyrene (PS) and poly methyl methacrylate (PMMA) matrixes and thin sheets of composites were produced by solution method. Mechanical properties of the composites were characterized using tensile test and their fracture surfaces, elemental composition and hydrophobic property were tested by SEM, EDX and contact angle techniques, respectively. The results exhibited better mechanical properties compared to pure polymer samples i.e. the elastic modulus in PMMA and PS composites, were increased about 107 and 109%, respectively. In addition the composite surfaces became more hydrophobic than pure polymer systems. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
5 citations