The invention relates to an initiating
system for preparing high-reaction activity polyisobutene and a
copolymer of polyisobutene, which comprises an initiator for initiating the
cationic polymerization of an isobutene-containing material, a coinitiator and a compounding ingredient, wherein the coinitiator is FeCl3; the compounding ingredient is an
oxygen- or
sulfur-containing
organic compound; the
molar mixing ratio of the FeCl3 and the isobutene
raw material ranges from 0.01 to 3.0; the
molar mixing ratio of the initiator to the FeCl3 ranges from 0.1 to 2.0; and the
molar mixing ratio of the compounding ingredient to the FeCl3 ranges from 0.1 to 3.4. In the invention, the FeCl3 is used as the compounding ingredient to be compounded with the
oxygen- or
sulfur-containing compounding ingredient to promote a reaction for removing active central carbocations beta-H, thus the high-reaction activity polyisobutene and the
copolymer of polyisobutene, which have terminal alpha-
double bond content of more than 75mol percent (even over 90 percent) and narrow molecular
weight distribution, can be obtained by a one-
step method. The process steps are simplified. The production cost is low. Therepeatability is high. The environmental
pollution is light. And the industrial application is easy.