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Browsing by Author "Focke, WW"

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The effect of magnesium hydroxide, hydromagnesite and layered double hydroxide on the heat stability and fire performance of plasticized poly(vinyl chloride)

Author: Molefe, DM ; Labuschagne, FJFWJ ; Focke, WW ; Van der Westhuizen, I ; Ofosu, O Date: Sep 2015 Emulsion grade PVC was plasticised with 100 phr diisononyl phthalate and filled with 30 phr of different hydrated filler-type flame retardant additives. Static heat stabilities were determined at 200 oC by following the time dependance of ... Read more
The effect of synthetic antioxidants on the oxidative stability of biodiesel

Author: Focke, WW ; Van der Westhuizen, I ; Lofté Grobler, AB ; Nshoane, KT ; Reddy, JK ; Luyt, AS Date: Apr 2012 Biodiesels were prepared using base catalyzed methanolysis of sunflower, soybean and canola oils. Rancimat oxidative stability measurements showed that the induction period (IP) for neat canola biodiesel conformed to EN 14214, the European ... Read more
Estimating the gas permeability of commercial volatile corrosion inhibitors at elevated temperatures with thermo-gravimetry

Author: Pieterse, N ; Focke, WW ; Vuorinen, E ; Racz, I Date: Aug 2006 Volatile corrosion inhibitors (VCIs) are incorporated into packaging paper or film to protect metals against atmospheric corrosion. The vapour pressure determines the equilibrium concentration of a volatile corrosion inhibitor (VCI) in the ... Read more
Flexible PVC flame retarded with expandable graphite

Author: Focke, WW ; Muiambo, H ; Mhike, W ; Kruger, HJ ; Ofosu, O Date: Feb 2014 The utility of expandable graphite as a flame retardant for PVC, plasticized with 60 phr of a phosphate ester, was investigated. Cone calorimeter results, at a radiant flux of 35 kW m 2, revealed that adding only 5 wt.% expandable graphite ... Read more
Layered double hydroxide derivatives as flame retardants for flexible PVC

Author: Labuschagnè, J ; Molefe, D ; Focke, WW ; Ofosu, Osei Date: Apr 2019 The use of layered double hydroxide (LDH) derivatives as flame retardants for PVC, plasticized with 100 phr diisononyl phthalate (DINP), was investigated. Cone calorimeter results, obtained at a radiant flux of 35 kW m(sup-2), revealed that ... 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
Optimization of perfluorocarbon emulsion properties for enhancing oxygen mass transfer in a bio-artificial liver support system

Author: Moolman, FS ; Rolfes, H ; Van der Merwe, SW ; Focke, WW Date: 29 Jul 2004 The oxygen carrying performance of a perfluorooctyl bromide (PFOB) emulsion is considered. The intended purpose is to enhance hepatocyte growth and function in a bio-artificial liver support system (BALSS). Such oxygen carrying emulsions have ... Read more
Polyethylene flame retarded with expandable graphite and a novel intumescent additive

Author: Focke, WW ; Kruger, HJ ; Mhike, W ; Taute, A ; Roberson, A ; Ofosu, O Date: Jul 2014 A novel intumescent additive was synthesized by neutralizing 3,5-diaminobenzoic acid hydrochloride salt with ammonium dihydrogen phosphate. This compound, which melts at 257 C, decomposes concurrently to release carbon dioxide gas. The flame ... Read more

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Browsing by Author "Focke, WW"

Browsing by Author "Focke, WW"

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