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T. Kleps, D. Jaroszyńska, L. Ślusarski


Thermal stability of hydrogenated nitrile elastomers (HNBR)


Polimery 1993, No 6, 258


DOI: dx.doi.org/10.14314/polimery.1993.258

Summary

Thermal stability of HNBR was investigated in an inert atmosphere by derivatography. HNBR with various degrees of hydrogenation manufactured by "Bayer" with the trade name Therban were investigated. They were compared with NBR of a similar acrylonitrile content as well as with the mixtures of these rubbers with carbon black or crosslinking agents and also with unfilled vulcanizates. These investigations showed that hydrogenation of NBR greatly changed character of the destruction process and improved thermal stability. The values of T, Tmax and activation energy of destruction for HNBR were much higher than the corresponding values for NBR whereas the dry residue after HNBR decomposition was many times lower than in the case of NBR, what largely influenced interpretation of the TG curves of HNBR-containing compositions. Our results showed a positive effect of carbon black on thermal stability of rubbers, whereas crosslinking agents deteriorated it considerably. The process of crosslinking distinctly improved thermal stability of vulcanizates in comparison with stability of a composition of uncrosslinked rubber with crosslinking system. An interpretation of the observed changes in thermal stability and character of the destruction process of nitrile rubbers due to their hydrogenation was proposed.


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