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Browsing by Subject "Polymers"

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Comparative study: The effects of solvent on the morphology, optical and structural features of regioregular poly(3-hexylthiophene):fullerene thin films

Author: Motaung, DE ; Malgas, GF ; Arendse, CJ Date: Jan 2010 In this report the effect of solvent to control the degree of mixing of the polymer and fullerene components, as well as the domain size and charge transport properties of the blends were investigated in detail using P3HT:C60 films. The polymer ... Read more
Computational modelling in materials at the University of the North

Author: Ngoepe, PE ; Catlow, CRA Date: Sep 2005 The authors review computational modelling studies in materials resulting from the National Research Foundation-Royal Society collaboration. Initially, investigations were confined to transport and defect properties in fluorine and oxygen ion ... Read more
Determination of structural changes of dispersed clay platelets in a polymer blend during solid-state rheological property measurement by small-angle X-ray scattering

Author: Bandyopadhyay, J ; Ray, SS Date: May 2011 The poly(ethylene terephthalate)/thermotropic liquid crystal polymer (weight ratio 80:20) blend composites with two different weight percentages of nanoclay were prepared using a twin-screw extruder. The frequency sweep experiments at a ... Read more
Determination of the structure, morphology and complex refractive index in ZnO-nanopencils/P3HT hybrid structures

Author: Motaung, DE ; Malgas, GF ; Arendse, CJ ; Mavundla, SE Date: Aug 2012 Well crystallized ﬂower-shaped ZnO-structures composed of a perfectly hexagonal-shaped ZnO structure were successfully synthesized using a simple microwave assisted hydrothermal method. The NPs with a hexagonal stem and a tapering tip grows ... Read more
Effect of heating temperature on the optical properties of sol-gel synthesized C/NiO nanocomposite thin films

Author: Roro, Kittessa T ; Tile, N ; Yalisi, B ; Forbes, A Date: May 2011 For efficient photo-thermal conversion of solar energy a spectrally selective solar absorber surfaces are widely used. An ideal selective surface should have a high absorptance (low reflectance) in the solar wavelength range (0.3 to 2.5 µm) ... Read more
Environmental friendly method for the extraction of coir fibre and isolation of nanofibre

Author: Abraham, E ; Deepa, B ; Pothen, LA ; Cintil, J ; Thomas, S ; John, Maya J ; Anandjiwala, R ; Narine, SS Date: Feb 2013 The objective of this work was to develop an environmental friendly method for the effective utilization of coir fibre by adopting steam pre-treatment. The retting of the coconut bunch makes strong environmental problems which can be avoided ... Read more
Environmentally friendly polymer nanocomposites: types, processing and properties

Author: Ray, Suprakas S Date: Jul 2013 In recent years, the development of eco-friendly polymeric materials with balanced properties has become a subject of research attention due to concerns with increasing global-warming, carbon-emission, and limited natural resources. ... Read more
Flax fabric reinforced arylated soy protein composites: A brittle-matrix behaviour

Author: Kumar, R ; Anandjiwala, RD Date: May 2012 Biocomposites were successfully prepared by the reinforcement of soy protein isolate (SPI) with different weight fractions of woven flax fabric. The flax-fabric-reinforced SPI-based composites were then arylated with 2,2-diphenyl-2-hydroxyethanoic ... Read more
Formation of an interpolymer complex in supercritical carbon dioxide and its application in the encapsulation of probiotics

Author: Moolman, S ; Labuschagne, Philip W ; Thantsha, MS ; Van der Merwe, TL ; Cloete, TE Date: 27 Feb 2006 Traditional encapsulation methods present difficulties for sensitive actives such as probiotics, due to exposure to water/solvents, heat, oxygen, etc. The authors present a novel encapsulation technology utilising the formation of an interpolymer ... Read more
Hybrid composites

Author: John, Maya J ; Anandjiwala, RD ; Thomas, S Date: Apr 2009 The incorporation of several different types of fibres into a single matrix has led to the development of hybrid biocomposites. The behaviour of hybrid composites is a weighed sum of the individual components in which there is a more favourable ... Read more
The impact of nanoclay on the crystal growth kinetics and morphology of biodegradable poly(ethylene succinate) composite

Author: Bandyopadhyay, J ; Ray, SS ; Scriba, Manfred R ; Malwela, T Date: Jul 2012 The impact of nanoclay on the isothermal crystal growth kinetics and morphology of biodegradable poly(ethylene succinate) (PES) is reported. A PES composite (PESNC) containing 5 wt% organically modified montmorillonite, was prepared via solvent ... Read more
Influence of electrospinning parameters on the structural morphology and diameter of electrospun nanofibers

Author: Jacobs, V ; Anandjiwala, RD ; Maaza, M Date: Nov 2009 Electrospinning is a simple method of producing nanofibers by introducing electric field into the polymer solutions. We report an experimental investigation on the influence of processing parameters and solution properties on the structural ... Read more
Lignocellulosic fiber reinforced rubber composites

Author: John, Maya J ; Anandjiwala, RD ; Thomas, S Date: Apr 2009 Natural Rubber (NR) is a naturally occurring elastomeric polymer of isoprene (2-methyl-1,3-butadiene). It can be extracted from latex of only one kind of tree, the Hevea braziliensis. Hevea rubber is produced in many tropical regions of ... Read more
Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene

Author: Salehiyan, Reza ; Bandyopadhyay, Jayita ; Ray, Suprakas S Date: May 2019 In this study, polyamide 6 (PA) is blended with ethylene vinyl alcohol (EVOH) to yield packaging materials with a balance of mechanical and gas barrier properties. However, the formation of gel-like structures in both polymers because of ... Read more
Metal oxides and noble metals application in organic solar cells

Author: Maake, Popoti J ; Bolokang, Amogelang S ; Arendse, CJ ; Vohra, V ; Iwuoha, EI ; Motaung, DE Date: Sep 2020 The integration of noble metals nanostructures can be an effective method to improve the performance of organic solar cells by scattering the incident light that reaches the active layer. The resulting elongated active optical trail span of ... Read more
Morphology and properties of nanocomposites based on polymer blend and organoclay

Author: Gcwabaza, T ; Suprakas, SR ; Focke, WW Date: Oct 2008 Forming a polymer blend is a convenient method for obtaining materials with improves property performance. However, most chemically different polymers are immiscible and their blending leads to a material with weak interfacial adhesion and ... Read more
Nanostructured Immiscible Polymer Blends: Migration and Interface

Author: Ray, Suprakas S ; Salehiyan, Reza Date: Sep 2019 Nanostructured Immiscible Polymer Blends: Migration and Interface covers a wide range of nanoparticle types, emphasizing the mechanisms and parameters involved in the migration of nanofillers inside immiscible polymer blends. This book explores ... Read more
Natural polymers: an overview

Author: John, Maya J ; Thomas, S Date: Aug 2012 The scarcity of natural polymers during the world war years led to the development of synthetic polymers like nylon, acrylic, neoprene, styrene-butadiene rubber (SBR) and polyethylene. The increasing popularity of synthetic polymers is partly ... Read more
Optimisation of optical absorption properties of spectrally selective C-NiO composite coatings

Author: Tile, N ; Roro, Kittessa T ; Forbes, A Date: May 2011 The demand for low cost, efficient and environmental friendly energy is increasing rapidly. Solar thermal energy is being widely investigated as a solution. Efficient thermal solar collectors require a spectrally selective material capable ... Read more
Optimisation of ported yield of hemispherical ported microparticles for soft tissue augmentation

Author: Barnard, A ; Kotzé-Jacobs, L ; Moolman, S Date: May 2011 The use of biodegradable polymers in temporary surgical and pharmacological applications has become a prominent part of polymer research. Poly(e-caprolactone) (PCL) is widely studied for tissue engineering applications due to its relatively ... Read more

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