Mechanical properties of poly(vinyl alcohol) nanocomposite films improved by graphene oxide-assisted nanoclay dispersion
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Application of paraffin and silver coated titania nanoparticles in polyethylene nanocomposite food packaging films
In this work, 3% and 5% TiO2/Ag nanoparticles were dispersed in low-density polyethylene through melt blending process, and subsequently nanocomposite films were prepared by hot pressing. Paraffin was used for the first time in this work as compatibilizer agent. The effect of TiO2/Ag nanoparticle content, as well as compatibilizer dosage on the antimicrobial, morphological, mechanical, and optical performance of the nanocomposite films was investigated. Improved mechanical properties of the nano...
Effect of organic modifiers on dispersion of organoclay in polymer nanocomposites to improve mechanical properties
Abstract The hydrophilic/hydrophobic organoclays with varying quaternary ammonium substituents (QAS) were successfully synthesized and used as filler in unsaturated polyester (UPE) resin-organoclay nanocomposites to enhance mechanical properties. The organoclay-BQASMMT 18 (octadecyldimethylbenzylammonium bromide modified montmorillonite) with only 3 wt% in the UPE enhanced tensile strength, tensile modulus, flexural strength and elongation at break by the order of 4.6, 2.4, 2 and 2.4, respective...
Abstract The temperature dependence of structural development in a self-exfoliating nano-composite system has been studied utilizing time resolved small angle x-ray scattering (SAXS) and time resolved mechanical spectroscopy (TRMS) employing small amplitude oscillatory shear (SAOS). This system consists of a montmorillonite organoclay and end-functionalized polybutadiene. Self-exfoliation refers to a system where a layered component, in this case clay, breaks into individual sheets randomly dist...
In this research weldability of AA6061 and AA2024 aluminum alloys by GTAW and FSW was studied. Friction Stir Welding (FSW) and Gas Tungsten Arc Welding (GTAWA) of AA6061 and AA2024 aluminum alloys were carried out with sheet thickness for both alloys was 3 mm. The process parameters used for FSW were 950 rpm tool rotational speed with feeding rate of 50 mm/min. Gas Tungsten Arc Welding of AA6061and AA2024 aluminum alloys was carried out using ER5356 filler rod to avoid the hot cracking and liqui...
Preparation and characterization of sulfonated graphene-enhanced poly (vinyl alcohol) composite hydrogel and its application as dye absorbent
Abstract In this paper, sulfonated graphene (SG) were incorporated into the poly (vinyl alcohol) (PVA) networks to fabricate the SG/PVA (SP) composite hydrogel. The as-prepared SP hydrogel exhibited enhanced mechanical property with a small amount of SG into the PVA matrix. In the meantime, the SP hydrogel showed specific adsorption of cationic dyes, such as Methylene Blue (MB), Malachite Green (MG). Studies on the adsorption isotherm and kinetics of the SP hydrogel showed that the equilibrium a...
Mechanical properties of the poly(vinyl alcohol) based nanocomposites at low content of surfactant wrapped graphene sheets
Abstract One necessary point towards achieving the enhanced mechanical properties in the nanocomposite systems, comprising a polymeric matrix and the graphene sheets (GSs) as the reinforcement, is the number of GSs layers regarding its relation with the gyration radius of the matrix. In this study, a stable suspension containing the surfactant wrapped graphene sheets (SWGSs) was successfully synthesized via a facile electrochemical route in the sodium dodecyl sulfate media. The effect of the app...
Preparation and characterization of poly(vinyl alcohol)/graphene nanofibers synthesized by electrospinning
Abstract We report on the synthesis and characterization of electrospun polyvinyl alcohol (PVA)/graphene nanofibers. The samples produced were characterized by Raman spectroscopy for structural and defect density analysis, scanning electron microscopy (SEM) for morphological analysis, and thermogravimetric (TGA) for thermal analysis. SEM measurements show uniform hollow PVA fibers formation and excellent graphene dispersion within the fibers, while TGA measurements show the improved thermal stab...
The graphene nanoribbon was prepared from the carbon nanotubes using the chemical approach, and was used for preparing the poly (vinyl alcohol) nanocomposites. It was discovered that the prepared graphene nanoribbon contained a lot of oxygen groups. Due to the presence of these oxygen groups, the nanoribbon could homogeneously disperse in both water and poly (vinly alcohol) matrix. It was also found that there were strong interactions between the graphene nanoribbon and the poly (vinyl alcohol) ...
In this article, current nanocomposite technologies to enhance the mechanical and barrier properties of synthetic polymers and biopolymers for food packaging are reviewed. In addition, nanotechnology developments targeting active packaging applications are discussed, including antimicrobial, oxygen scavenging, and shelf-life extension of food. Nanotechnologies that are currently being exploited for the development of intelligent packaging with enhanced communication function are presented, focus...
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