Authors: M. Lipinska, J. Pietrasik, M. Zaborski, A. Masek
Affilation: Institute of Polymer and Dye Technology, Poland
Pages: 535 - 538
Keywords: composite, elastomer, hydroxyapatites, layered fillers
Traditionally, as a filler of rubber carbon black is used. It is an active filler able to reinforce and improve the properties of finished rubber products. For ecological and economic reasons the research activity is focused on looking for new methods of surface modification of inactive fillers to enhance their strengthening performance in elastomers. Montmorillonites are incompatible with most polymers and therefore is necessary to modify them in order to increase layer-spacing and to facilitate the penetration of polymer chains. The modification involves introducing various organic cations in place of sodium cation present between layers. In our study as a elastomer fillers also hydroxyapatites were used. Surface properties of modified fillers, the zeta potential of suspended solids in the water, the oil absorption number, the impact of modifications on the tendency to agglomerate in the non-polar and polar medium were investigateded. The modified fillers were used in elastomer matrix with different polarity: the ethylene-propylene copolymer EPM and acrylonitrile-butadiene rubber XNBR. The effect of the application of fillers on the cross-linking density of the vulcanizates, rheometric and mechanical properties of filled systems was investigated. The ageing studies (thermal, atmospheric and under UV radiations) were conducted.
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