STUDY OF SYNTHESIS OF HIGH VINYL POLYBUTADIENE WITH TETRAVALENT MOLYBDENUM CATALYST SYSTEM
四价钼催化体系合成高乙烯基聚丁二烯的研究

The catalytic behaviour of tetravalent molybdenum catalyst system in the polymerization of dutadiene has been studied. The ca.talyst system is highly active when anions that combined with molybdenum are carboxylic acid group (BCOO-) or alkoxy (-OR) group. Obviously, the variety of substituent R in (i-Bu)2AlOR has great influence on the catalytic activity. The system is inactive, if the R group is carboxylic acid or alkoxy, while the activity of catalyst system increases if the R group is phenyl or tolyl. The content of 1,2-unit and the molecular weight of polymer decreases while the destri-bution index increases as polymerization temperature rises.