Initiator system for preparing isoolefine homopolymers or copolymers, and method for preparing isoolefine homopolymers or copolymers by using same

The invention relates to a Lewis acid-carbon cationic-polymerization initiator system for preparing isoolefine polymers or copolymers, and a method for preparing high-molecular-weight isoolefine polymers or copolymers by adopting cationic polymerization. The method comprises the steps of using a Lewis acid-carbon cationic initiator system to perform homopolymerization of isoolefine monomers or copolymerization of the isoolefine monomers and other polyene hydrocarbon, and ensuring that obtained polymers have the characteristic of adjustable molecular weight distribution in a certain range by introducing organic tin compounds.