Preparation and Characterization of Crystalline 3,4-Polyisoprene

Abstract Gel-free, semi-crystalline polyisoprenes containing 70–81% 3,4 units were prepared using an improved iron catalyst. A partially hydrolyzed triisobutylaluminum was used as the reducing agent for the improved catalyst, which allowed the title polymers to be prepared in aliphatic solvents at fast rates.