异丁烯弹性体包括丁基橡胶和卤化丁基橡胶及其各自的星形-支化种类。由于这些聚合物具有不透气性及耐热和耐氧化性,所以它们用于轮胎内衬层和内胎、硫化胶囊和包封套,以及需要气密性及耐热和耐老化的场合。丁基橡胶是在-90~-100℃下于氯化甲烷中经阳离子聚合制备的。丁基橡胶具 Isobutylene elastomers include butyl rubber and halogenated butyl rubber and their respective star-branched species. Because of their airtightness and heat resistance and oxidation resistance, these polymers are used in tire innerliners and inner tubes, vulcanized capsules and envelopes, as well as where gas tightness and heat and aging resistance are required. Butyl rubber is prepared by cationic polymerization in methane chloride at -90 to -100 ° C. Butyl rubber