Degradation of hydrogenated nitrile-butadiene rubber in aqueous solutions of H₂S or HCl

Abstract

The degradation of hydrogenated nitrile-butadiene rubber(HNBR) soaped in aqueous solutions of H₂S and HCl was investigated. The samples unexposed and exposed to different solutions were characterized by ¹³C nuclear magnetic resonance, X-ray photoelectron and infrared spectroscopies. In contrast to those of unexposed samples and samples soaped in HCl solution, the mechanical properties of samples exposed to H₂S solution significantly deteriorated, in which the new groups of C(=O)-NH₂, C-S-C and C=S emerged. The mechanism of C=S and C-S-C formation was speculated, except for that of the formation of group C(=O)-NH₂, which was widely discussed in acidic condition such as HCl solution. The formation of C-S-C was due to radical reaction initiated by mercapto radical and that of C=S was due to nucleophilic reaction initiated by mercapto cations. This finding is helpful to understanding the seal failure of HNBR in working environment containing H₂S.

Keywords

Hydrogenated nitrile-butadiene rubber(HNBR) / Degradation mechanism / H₂S corrosion

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