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Vol. 25 No. 9 (2013): Vol 25 Issue 9

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Comparison of Properties of Admicellar Polymerization Surface Modified Silica- and Conventional Fillers-Reinforced Tyre Tread Compounds

https://doi.org/10.14233/ajchem.2013.F23
P. Toh-Ae
Department of Rubber Technology and Polymer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand
T. Pongprayoon
Department of Chemical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology, North Bangkok, Bangkok 10800, Thailand
N. Lopattananon
Department of Rubber Technology and Polymer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand
K. Sahakaro
Department of Rubber Technology and Polymer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand

Corresponding Author(s) : K. Sahakaro

skannika@bunga.pn.psu.ac.th

Asian Journal of Chemistry, Vol. 25 No. 9 (2013): Vol 25 Issue 9

Abstract

Silanol groups on a silica surface lead to strong hydrogen bonding between the silica particles and aggregates, resulting in a poor dispersion of silica in rubber compounds. This study improved the compatibility between silica and rubber by coating the silica surface with a polyisoprene film using an admicellar polymerization technique. The modified silica was characterized by Fourier-transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. A comparison of the properties of natural rubber compounds filled with modified silica, silica with silane, carbon black and a mixed filler of silica and carbon black showed that the silica-silane filled compound exhibited the highest mixing torque and Mooney viscosity, whereas the modified silica-filled compound exhibited the lowest values. The silica-silane filled vulcanizates showed a higher modulus, reinforcing index, hardness and abrasion resistance than the vulcanizates containing modified silica. On the other hand, the modified silica-filled vulcanizates exhibited excellent ultimate tensile properties. The loss tangent at 0 ºC and 60 ºC of the vulcanizates filled with different types of fillers as well as filler dispersion are also discussed.

Keywords

Natural rubber Silica Modified silica Tyre compounds Reinforcement Fillers
Toh-Ae, P., Pongprayoon, T., Lopattananon, N., & Sahakaro, K. (2013). Comparison of Properties of Admicellar Polymerization Surface Modified Silica- and Conventional Fillers-Reinforced Tyre Tread Compounds. Asian Journal of Chemistry, 25(9), 5226–5232. https://doi.org/10.14233/ajchem.2013.F23
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