Abstract

The processing and mechanical properties of green and vulcanised breaker rubbers based on natural rubbers containing single-wall carbon nanotubes (SCNTs) were studied. SCNTs were treated and introduced into a rubber mix in a composite containing carbon black (88.24%), SCNTs (9.8%), and SKI-3 polyisoprene rubber in solution (1.96%). The presence of –COOH groups on the surface of SCNTs after treatment was confirmed by IR spectroscopy. Increase in the content of SCNTs in the breaker rubber mix to 0.15 or 0.2% leads to an increase in cohesion strength up to 1.6-fold; the Mooney viscosity also increases, and there is an improvement in the vulcanisation properties. Changes in the Payne effect of rubbers containing SCNTs indicate an improvement in the interaction between the carbon black particles. Small amounts of SCNTs ensure a reduction in tg δ at 60°C, and increases in tear strength and in adhesion to metal cord. However, wear resistance deteriorates. The possibility of replacing 30 parts natural rubber with SKI-3 in the presence of SCNTs is shown.

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