羧基丁腈橡胶(XNBR)的交联是由永久共价键和热稳定性小的离子键混合形成的,由于离子键的存在,它的机械性能优于通常的丁腈橡胶(NBR)。离子键由羧基群和多价金属氧化物反应形成,在聚合网状中相当于补强填充剂。然而在伸长小的情况下,有着较高的弹性模量,这几乎仅仅是由于增强了交联密度而引起的,在高伸长或者邻界 Crosslinking of carboxylated nitrile rubber (XNBR) is a combination of permanent covalent bonds and ionic bonds with low thermal stability. Due to the ionic bond, its mechanical properties are superior to those of conventional nitrile rubber (NBR). The ionic bond is formed by the reaction of a carboxyl group and a polyvalent metal oxide, which corresponds to a reinforcing filler in the polymeric network. In the case of small elongation, however, there is a higher modulus of elasticity, which is caused almost exclusively by the increased crosslinking density, at high elongation or at the border