Isoolefin copolymer and preparation method thereof

The invention relates to the field of polymer preparation, and discloses an isoolefin copolymer and a preparation method thereof. The method comprises the following steps that in the presence of a diluent containing hydrofluoroolefin and an initiator solution, an isoolefin monomer and a conjugated diene monomer are subjected to a polymerization reaction, the high-unsaturation-degree isoolefin copolymer is obtained, and the weight ratio of the conjugated diene monomer to the isoolefin monomer is 4: 96-10: 90. According to the preparation method, hydrofluoroolefin is taken as a diluent, so that the prepared isoolefin copolymer has high unsaturation degree, and the content of cyclic oligomer of the isoolefin copolymer can be remarkably reduced. 本发明涉及聚合物制备领域，公开了一种异烯烃共聚物及其制备方法。该方法包括以下步骤：在包括含氢氟烯烃的稀释剂和引发剂溶液的存在下，异烯烃单体和共轭二烯烃单体进行聚合反应，得到高不饱和度异烯烃共聚物，所述共轭二烯烃单体与所述异烯烃单体的重量比为4：96-10：90。该制备方法中以氢氟烯烃作为稀释剂，由此制得的异烯烃共聚物不仅具有高不饱和度，并且能够显著降低异烯烃共聚物的环状低聚物的含量。