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 article, the preparation of E-glass/waterborne epoxy prepregs containing natural nanoclay and properties of their composites are presented, which are then used to fabricate disk-shaped composite samples by APA2000 rheometer.
Abstract: Preparation of E-glass/waterborne epoxy prepregs containing natural nanoclay and properties of their composites are presented. Prepregs were prepared by wetting randomly oriented, chopped glass fiber preforms with aqueous dispersion of EpiRez 3522-W-60 resin, dicyandiamide, 2-methylimidazole and natural nanoclay (Cloisite 1 Na þ ). The nanoclay content of the aqueous dispersion was adjusted to yield final nanoclay contents of 0, 1, 2, and 4 wt%, whereas the glass fiber content is kept constant at 47 wt%. These prepregs were then used to fabricate disk-shaped composite samples by APA2000 rheometer. Composite samples were tested for interlaminar shear strength, flexural stiffness, and glass transition temperature. The flexural stiffness was observed to increase by more than 26% over the range of nanoclay loading, despite a 13% decrease in interlaminar shear strength. Similarly, glass transition temperature increased from 898 Ct o above 948C for the samples comprising 4 wt% nanoclay. X-ray diffraction analyses indicated 48% increase in the gallery spacing suggesting strong intercalation of the nanoclay platelets by the epoxy matrix. Microstructural observations of the fracture surfaces and polished surfaces show significant differences in the matrix topology and fiber to matrix adhesion. The composites with higher nanoclay content depict uniform and submicron surface features implying homogenous dispersion of nanoclay. POLYM. COMPOS., 31:620–629, 2010. a 2009 Society of Plastics Engineers
29 citations
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
TL;DR: In this paper, a spray-drying process was used to produce well-dispersed clays in a polymer matrix by a spraydrying method, which were then successfully extruded into clay/poly(methyl methacrylate) nanocomposite bulk structures without any perturbation of the well dispersed clay nanostructure in the original microspheres.
Abstract: A new strategy for the preparation of well-dispersed clays in a polymer matrix by a spray-drying method is presented. Scanning electron microscopy and transmission electron microscopy measurements show that the spray-drying process produces clay/polymer microspheres in which the clay is trapped in a well-dispersed state throughout the polymer matrix. The microspheres have been successfully extruded into clay/poly(methyl methacrylate) nanocomposite bulk structures without any perturbation of the well-dispersed clay nanostructure in the original microspheres. Transmission electron microscopy and small-angle X-ray scattering show that the clay particles in the extruded materials range from single platelets to simple tactoids composed of a few stacked clay platelets, indicating an excellent degree of dispersion. The results show that sprayed microspheres are very good precursors for further processing such as extrusion or melt blending with other polymers for bulk nanocomposite fabrication. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
12 citations
TL;DR: Transparent mirror coated SiO 2 -Ag/PV P nanocomposites were prepared on the Pyrex glass slides by dip-coating technique Embedding of the silver (Ag) nanoparticles on silica modified polyvinyl pyrrolidone (PVP) was performed by the sol-gel method as discussed by the authors.
7 citations