Preparation and Properties of Organokaolin Natural Rubber Latex Base Vulcanisate
Ogbemudia Joseph Ogbebor,
Felix Ebhodaghe Okieimen,
David Ehioghilen Ogbeifun,
Uzoma Ndubuisi Okwu
Issue:
Volume 4, Issue 4, August 2015
Pages:
75-79
Received:
14 May 2015
Accepted:
21 June 2015
Published:
18 July 2015
Abstract: Natural rubber (NR) latex-organokaolin compounds have been investigated. The intercalated kaolin (100% CEC-CTAB of clay) was used in aqueous rubber latex dispersion, from which a coagulum was obtained. The coagulum was used in natural rubber compounds and evaluated for its cure: scorch; ts1, optimum cure; t90 min, minimum (ML) and maximum (MH) torque and mechano-physical properties viz: M100, M300, EB (%), hardness and abrasion in mg/1000 rev. The scorch and optimum cure indicated a progressive drop with addition of organokaolin in natural rubber latex based compounds. Vulcanisate mechanical properties generally showed increase as organokaolin loading increased. A correlation between the measure of extent of vulcanization (MH-ML) and properties such as tensile strength, elongation at break, abrasion and hardness showed that the extent of crosslinking as a result of rubber-filler interaction of the natural rubber based compounds increased as organokaolin loading increased.
Abstract: Natural rubber (NR) latex-organokaolin compounds have been investigated. The intercalated kaolin (100% CEC-CTAB of clay) was used in aqueous rubber latex dispersion, from which a coagulum was obtained. The coagulum was used in natural rubber compounds and evaluated for its cure: scorch; ts1, optimum cure; t90 min, minimum (ML) and maximum (MH) torq...
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The Effect of Microsilica and Aluminum Metal Powder on the Densification Parameters, Mechanical Properties and Microstructure of Alumina–Mullite Ceramic Composites
M. M. S. Wahsh,
H. E. H. Sadek,
S. Abd El-Aleem,
H. H. M. Darweesh
Issue:
Volume 4, Issue 4, August 2015
Pages:
80-84
Received:
26 June 2015
Accepted:
9 July 2015
Published:
28 July 2015
Abstract: Microsilica, or silica fume, is an amorphous type of silica mostly collected as byproduct of the silicon and ferro-silicon alloy production. In this work, low shrinkage alumina-mullite ceramic composites were prepared from mixtures of calcined alumina, silica fume and aluminum metal powder and sintered at 1550oC for 2 hrs. The influence of silica fume and aluminum powder on the densification parameter, in situ mullite formed and mechanical properties of sintered samples were studied. The phase composition and the microstructural evolution of the sintered samples were also investigated. The results showed that, silica fume enhances the mechanical properties of sintered samples, while the aluminum powder improves the mullite formation process. Ultra low shrinkage (close to zero), and good mechanical properties (CCS ≈ 70 MPa) of alumina-mullite ceramic composites were achieved. Alumina-mullite ceramic composites are considered a promising material for high temperature applications.
Abstract: Microsilica, or silica fume, is an amorphous type of silica mostly collected as byproduct of the silicon and ferro-silicon alloy production. In this work, low shrinkage alumina-mullite ceramic composites were prepared from mixtures of calcined alumina, silica fume and aluminum metal powder and sintered at 1550oC for 2 hrs. The influence of silica f...
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