Ionic Liquids Applied to Improve the Dispersion of Calcium Oxide Nanoparticles in the Hydrogenated Acrylonitrile-Butadiene Elastomer

摘要

Hydrogenated acrylonitrile-butadiene elastomer was cured with dicumyl peroxide in the presence of calcium oxide nanoparticles modified with 2,4-pentadienoic acid as a crosslinking co-agent and ionic liquids (alkylimidazolium salts) as a dispersing agent. In this article, we discuss the effect of the ionic liquids (alkylimidazolium salts) with respect to their anion (bromide, chloride, tetrafluoroborate, hexafluorophosphate) and the length of alkyl chain in the cation (allyl-, ethyl-, butyl-, hexyl-, octyl-) on the vulcanization kinetics of rubber compounds. The influence of ionic liquids on the cross-link density, the mechanical properties of the vulcanizates and their resistance to weather ageing were also studied. Alkylimidazolium salts improve the dispersion of the coagent particles and are active in the crosslinking of HNBR with peroxide. The application of ionic liquids increases the crosslink density of the vulcanizates and improves their resistance to weather aging.