Elektronen- und Gammastrahlen-Vernetzung von hydriertem Acrylnitril-Butadien-Kautschuk
von MSc. Jacek M. Bik, Dr. Wladyslaw M. Rzymski
In order to initiate the crosslinking hydrogenated acrylonitrile-butadiene rubber (HNBR) was proceeded with electron beam or gamma radiation. Several HNBRs differing each other in chemical structure, i. e. in hydrogenation degree (94,5 – 99,5 mol %) or bound acrylonitrile content (34 – 43 wt. %), were chosen to investigation. There was found no significant influence of HNBR chemical structure on the effective radiation crosslinking efficiency, however chemical radiation yield was slightly effected by rubber polarity as well as by the residual carbon-carbon double bonds content. The radiation crosslinking is accompanied by some scission of the elastomer chains (p/q = 0,05 – 0,10), but the chemical structure of the rubber does not influence significantly its degradation processes. In spite of different conditions taken into consideration during radiation crosslinking (irradiation atmosphere, radiation type) there was found only insignificant differences in the density of three-dimensional networks. Non-rubber constituents appeared as inhibitor in commercial HNBR increase significantly gel dose and decrease the crosslinking degree.