A homogeneous phosphate ester rare earth catalytic system was constructed with solubi-lized neodymium di(2-ethylhexyl)phosphate eater as the main catalyst,alkyl aluminum and aluminum chloride as co-catalyst and the third component,re-spectively.The copolymerization of butadiene and isoprene was catalyzed by this catalytic system.The effects of the composition and dosage of alkyl alu-minum and aluminum chloride,catalyst dosage,and monomer feeding ratio on the properties of the copolymer were studied.The results showed that the catalytic system could efficiently catalyze the copolymerization of butadiene and isoprene,and the resulting polymer was a random butadiene-isoprene rubber with high cis-1,4-unit stereoregularity and narrow molecular weight distribution.When di-isobutylaluminum hydride was chosen as the alkyl aluminum,the catalytic system exhibited reversible coordination chain transfer polymerization charac-teristics with 10.3 polymer molecular chains gene-rated per neodymium atom.
关键词
丁戊橡胶/磷酸酯钕/顺式-1,4-结构含量/可逆配位链转移/丁二烯/异戊二烯/分子量及其分布
Key words
butadiene-isoprene rubber/neodymium phosphate ester/cis-1,4-unit content/reversible coordination chain transfer/butadiene/isoprene/molecular weight and its distribution
维普
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