Browsing Research Articles (Chemistry) by Author "Focke, Walter Wilhelm"

Browsing Research Articles (Chemistry) by Author "Focke, Walter Wilhelm"

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  • Accelerated photo-oxidation of Polyamide 11 nanocomposites under various clays nanofillers 
    Dehouche, Nadjet; Kaci, Mustapha; Focke, Walter Wilhelm; Van der Merwe, Liezel (Wiley, 2022-08)
    The effect of various clays nanofillers on the photo-oxidation of polyamide 11 (PA11) has been investigated by accelerated ultraviolet (UV) test up to 780 h. Organo-modified montmorillonite, halloysite nanotubes, and ...
  • Characterizing the thermal phase behaviour of fipronil polymorphs 
    Moyo, Dennis Simbarashe; Van der Merwe, E.M. (Elizabet Margaretha); Rademeyer, Melanie; Malan, F.P. (Frederick); Atanasova, Maria T.; Mapossa, António Benjamim; Focke, Walter Wilhelm (Springer, 2023-07)
    This manuscript reports the investigation of the polymorphic behaviour of fipronil using a systematic comparison of the thermochemical and structural properties of different crystal forms obtained in this study as well as ...
  • A degradation study of polyamide 11/vermiculite nanocomposites under accelerated UV test 
    Kaci, Mustapha; Dehouche, Nadjet; Focke, Walter Wilhelm; Van der Merwe, E.M. (Elizabet Margaretha) (Wiley, 2019-12)
    Accelerated photooxidation under ultraviolet (UV) test of polyamide 11 (PA11) films filled with unmodified vermiculite clay at 5 wt% was investigated up to 600 h. Film samples of ~60‐μm thick were prepared by melt compounding ...
  • The effects of unmodified vermiculite on photooxidation of polyamide 11 nanocomposites under accelerated UV test 
    Kaci, Mustapha; Focke, Walter Wilhelm; Van der Merwe, E.M. (Elizabet Margaretha) (American Institute of Physics, 2018-07)
    The effects of unmodified vermiculite (UMVC) clay on the photooxidation of polyamide 11 (PA11) were investigated by accelerated UV test up to 600 h. The clay was incorporated to the polymer at a content ratio of 5 wt. %. ...
  • Heat stabilising flexible PVC with layered double hydroxide derivatives 
    Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus); Molefe, Dan Matlhomola; Focke, Walter Wilhelm; Van der Westhuizen, Isbe; Wright, Harry Charles; Royeppen, Mikhail David (Elsevier, 2015-03)
    Please read abstract in the article.
  • Layered double hydroxide derivatives as flame retardants for flexible PVC 
    Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus); Molefe, Dan; Focke, Walter Wilhelm; Ofosu, Osei (Wiley, 2019-04)
    Please read abstract in the article.
  • Mosquito repellent thermal stability, permeability and air volatility 
    Mapossa, António Benjamim; Sitoe, Alcides Everildo José; Focke, Walter Wilhelm; Izadi, Homa; Du Toit, Elizabeth Louisa; Androsch, Rene; Sungkapreecha, Chanita; Van der Merwe, E.M. (Elizabet Margaretha) (Wiley, 2020-03)
    Please read abstract in the article.
  • Oxidation induction time and oxidation onset temperature of polyethylene in air : testing Gimzewski’s postulate 
    Focke, Walter Wilhelm; Van der Westhuizen, Isbe (Springer, 2010-01)
    Oxidation induction times (OIT) and oxidation onset temperatures (OOT) of a low density polyethylene melt were evaluated in air using DSC. Good regression fits to OOT data were obtained using global values for the ...
  • A promising azeotrope-like mosquito repellent blend 
    Izadi, Homa; Focke, Walter Wilhelm; Asaadi, Erfan; Maharaj, Rajendra; Pretorius, Jannie; Loots, Mattheus Theodor (Nature Publishing Group, 2017-08-31)
    Topical repellents play a key role in reducing the outdoor transmission of mosquito-borne diseases by reducing human-vector contact. Excellent repellents are available, but there is always room for improvement. This ...
  • Strong base catalyzed intumescent flame retardants 
    Focke, Walter Wilhelm; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus); Strydom, C.A. (Springer, 2000-04)
    Intumescent flame retardants form a foamed-char barrier layer when exposed to a flame. Conventional systems are based on the acid catalysed dehydration of carbonifics such as dipentaerythritol. Metal oxides also have utility ...
  • Titania recovery from low-grade titanoferrous minerals 
    Manhique, A.J. (Arao Joao); Focke, Walter Wilhelm; Madivate, Carvalho (Elsevier, 2011-10)
    In this study a novel process for extraction of titanium valuables from its minerals is presented. The process entails roasting of titanium ore with alkaline metal salt, hydrolysing fused cake and dissolution in acid. Optimum ...