Abstract - A New Design Concept for Natural Rubber Compounds Using Silanised Precipitated Silica


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract A New Design Concept for Natural Rubber Compounds Using Silanised Precipitated Silica A. Ansarifar, A. Azhar and M. Song The reinforcing effect of 30 p.h.r. silanised precipitated amorphous white silica filler on the technical properties of a sulphur cured natural rubber compound, with a sulphur to accelerator ratio of about 0.046, was studied. The surfaces of the silica were pre-treated with bis[3triethoxysilylpropyl-) tetrasulphane (TESPT), a bifunctional organosilane, to prevent the silica from interfering with the reaction mechanism of the sulphur cure system in the rubber. This study showed that hardness, tensile strength, abrasion resistance, stored energy density at rupture, and cohesive tear strength of the rubber were enhanced substantially, but elongation at break and cyclic, fatigue life deteriorated after the filler was added to the rubber. Interestingly, the technical properties of the rubber improved even more significantly without the added sulphur, and by optimising the reaction between the rubber reactive tetrasulphane groups of TESPT and the rubber compound. The improved properties were due to the fine dispersion of the filler in the rubber matrix, and also the strong rubber/TESPT interaction. The latter was produced by the addition of 4.4 p.h.r. of a sulphenamide type accelerator to the rubber compound. back
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