Browsing Faculty of Natural and Agricultural Sciences by Author "23297573 - Young, Desmond Austin"
Now showing items 1-11 of 11
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Aluminum triflate-cocatalyzed radical copolymerization of styrene and ethyl acrylate
Guyo, Upenyu; Otto, Daniel P.; Young, Desmond A.; Vosloo, Hermanus C.M. (Springer, 2020)Various random copolymers, poly(styrene-co-ethyl acrylate), were synthesized by free radical bulk copolymerization cocatalyzed by aluminum triflate (Al(OTf)3). The experimental conditions for the polymerization reactions, ... -
Catalytic oxidation of alcohols with novel non-heme N4-tetradentate manganese(II) complexes
Vermaak, Vincent; Young, Desmond A.; Swarts, Andrew J. (RSC, 2018)We report the preparation and characterisation of a series of novel non-heme N4-tetradentate Mn(OTf)2 complexes of the type, [(L)MnOTf2], where L = R,R and S,S enantiomers of BPMCN, its 6-methyl and 6-bromo derivatives as ... -
Chemical oxidative polymerization of m-phenylenediamine and its derivatives using aluminium triflate as a co-catalyst
Amer, Ismael; Young, Desmond Austin; Vosloo, Hermanus C.M. (Elsevier, 2013)Aromatic diamine monomers, including m-phenylenediamine (mPD), 2-methyl-m-phenylenediamine (2Me-mPD), 4-methyl-m-phenylenediamine (4Me-mPD) and trimethyl-mphenylenediamine (tMe-mPD), were polymerized by chemical oxidation ... -
Chemically oxidative polymerization of aromatic diamines: the first use of aluminium-triflate as a co-catalyst
Amer, Ismael; Young, Desmond Austin (Elsevier, 2013)Aromatic diamine monomers, including o-phenylenediamine (oPD), p-phenylenediamine (pPD), 4,4′-diaminodiphenylenemethane (DADPM) and benzidine (BZN), were polymerized by chemical oxidation using sodium persulfate, potassium ... -
Colloidal synthesis of monodispersed ZnS and CdS nanocrystals from novel zinc and cadmium complexes
Onwudiwe, Damian C.; Mohammed, Aliyu D.; Strydom, Christien A.; Young, Desmond A.; Jordaan, Anine (Elsevier, 2014)Monodispersed spherical and hexagonal shaped ZnS and CdS nanocrystals respectively, have been synthesized using novel heteroleptic complexes of xanthate (S2CObu) and dithiocarbamate (S2CNMePh). The nanocrystals were prepared ... -
Oxidative copolymerization of p-phenylenediamine and 3-aminobenzenesulfonic acid
Amer, Ismael; Young, Desmond A.; Vosloo, Hermanus C.M.; Mokrani, Touhami; Jewell, Linda (Elsevier, 2016)The sulfonation of poly(p-phenylenediamine) (P(pPD)) was achieved by oxidative copolymerization of p-phenylenediamine (pPD) and 3-aminobenzenesulfonic acid (3ABSA) monomers using ammonium persulfate ((NH4)2S2O8). The yield, ... -
Synthesis and characterization of sulfonated poly(pphenylenediamine) prepared by different procedures
Amer, Ismael; Young, Desmond A.; Vosloo, Hermanus C.M.; Mokrani, Touhami; Jewell, Linda (Elsevier, 2015)The sulfonation of poly(p-phenylenediamine) (P(pPD)) polymer was reported and described in this study. The sulfonated P(pPD) polymers (SP(pPD)) with a degree of sulfonation (S/N molar ratio) range of 0.07–0.38 were prepared ... -
Synthesis and study of superabsorbent properties of acryloylated starch ester grafted with acrylic acid
Mohammed, Aliyu D.; Young, Desmond A.; Vosloo, Hermanus C.M. (Wiley, 2014)A superabsorbent polymer has been prepared by acryloylation of starch followed by grafting with acrylic acid (AA) using Fenton's initiation system (Fe2+/H2O2). Fourier-transform infrared spectroscopy (FTIR) analyses provided ... -
Synthesis of high-performance superabsorbent glycerol acrylate-cross-linked poly (acrylic acid)
Mohammed, Aliyu D.; Young, Desmond A.; Vosloo, Hermanus C.M. (Springer, 2017)Glycerol acrylate (GA) is synthesised by an acryloylation reaction with acryloyl chloride. An ester was used as a cross-linking agent at varying proportions in the synthesis of poly acrylic acid (PAA). The amount of ... -
Synthesis of highly-confined CdS nanoparticles by copolymerization of acryloylated starch
Mohammed, Aliyu D.; Onwudiwe, Damian C.; Young, Desmond A.; Vosloo, Hermanus C.M. (Elsevier, 2014)A simple method for the synthesis of highly-confined and monodispersed, polyacryloylated starch-capped CdS nanoparticles (PAS-CdS) is reported. The synthesized nanoparticles exhibited a strong quantum confinement effect ... -
Using aluminium triflate as a co-catalyst for the polymerization of o-phenylenediamine and its derivatives
Amer, Ismael; Young, Desmond A.; Vosloo, Hermanus C.M. (Wiley, 2014)Aromatic diamine monomers, including o-phenylenediamine (oPD), 4-methyl-o-phenylenediamine (4Me-oPD), 4,5-dimethylo- phenylenediamine (dMe-oPD) and 4-(tert-butyl)-o-phenylenediamine (tBu-oPD), were polymerized by chemical ...