ADHESION PROPERTIES OF COMPOSITIONS BASED ON NITRILE-BUTADIENE RUBBER AND THIOKOL MIXTURES IN THE PRESENCE OF CARBON NANOTUBES

The elastomer compositions based on a mixture of nitrile butadiene rubber and thiokol modified with carbon nanotubes were studied. The concentration dependence of the adhesion strength on the composition of the compound (the ratio of nitrile butadiene rubber and thiokol) in the presence of carbon nanotubes and without them has an extreme character. It is shown that the best adhesive properties are possessed by compositions based on nitrile butadiene rubber containing 20 wt. p. of thiokol, a further increase in the thiokol content in the composition based on butadiene-nitrile rubber leads to a decrease in the adhesive strength. For compositions modified with nanotubes, increased values of adhesive strength are observed compared to the original materials. This fact is certainly positive from the point of view of ensuring the operational properties of the proposed materials. It is shown that the introduction of carbon nanotubes in an amount of 0.1% by weight leads to a significant increase in the conditional modulus at 100 % elongation, the breaking stress at tension. At the same time, the relative elongation at break is slightly reduced. In general, there is an agreement between the values of the strength of the adhesive bond and the work of destruction of the materials under study, with the exception of the control sample of butadiene-nitrile rubber without additives, since it is a rigid material and does not have, unlike other compositions, the properties of pressure-sensitive adhesives. In general, the patterns of change in the adhesive characteristics of the materials under study correspond to those for pressure-sensitive sealants.