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A complexed initiating system AlCl 3 ·phenetole/TiCl 4 ·H 2 O was prepared by simply compounding AlCl 3 /phenetole and TiCl 4 /H 2 O and used for cationic polymerization of isobutylene. It was found AlCl 3 ·phenetole/TiCl 4 ·H 2 O exhibited activities 1.2-3 times higher than those of AlCl 3 /phenetole, and more than an order of magnitude higher than those of TiCl 4 /H 2 O, which indicated a notable synergistic effect produced in the complexed system. In addition, due to the higher activity of AlCl 3 ·phenetole/TiCl 4 ·H 2 O, lower coinitiator concentration and polymerization temperature, as well as higher monomer concentration were more favored for this complexed initiating system to produce polyisobutylene (PIB) with reasonable molecular weight (M w ) and molecular weight distribution (MWD). Furthermore, high molecular weight polyisobutylene (HPIB) with M w = 1-3 × 10 5 g·mol -1 could be successfully produced by the complexed catalyst system at T p = -60 to -40 °C. As a whole, the high activity as well as the simple preparation procedures of the complexed initiating system offer us a unique approach for the production of HPIB with improved efficiency.

polymers

A Complexed Initiating System AlCl3·Phenetole/TiCl4·H2O with Dominant Synergistic Effect for Efficient Synthesis of High Molecular Weight Polyisobutylene