摘要
Function of chloride and effect of various alkylaluminiums, Cl/Al molar ratio, solvents on cyclization in situ of isoprene polymerization catalyzed by Nd Al bimetallic complex were studied. The structure of cyclized products was characterized by means of IR and 1H NMR. The results indicated that in the course of isoprene polymerization with rare earth catalytic system, the function of alkylchloride introduced is terminating cis polymerization and generating cationic species with alkyl aluminums to initiate cyclization in situ . Soluble cyclized polyisoprene was obtained with fragments of cyclopolyisoprene.
Function of chloride and effect of various alkylaluminiums, Cl/Al molar ratio, solvents on cyclization in situ of isoprene polymerization catalyzed by Nd Al bimetallic complex were studied. The structure of cyclized products was characterized by means of IR and 1H NMR. The results indicated that in the course of isoprene polymerization with rare earth catalytic system, the function of alkylchloride introduced is terminating cis polymerization and generating cationic species with alkyl aluminums to initiate cyclization in situ . Soluble cyclized polyisoprene was obtained with fragments of cyclopolyisoprene.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第3期493-495,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金!(批准号 :2 95 74179)资助
关键词
双金属催化剂
聚异戊二烯
环聚反应
钕
铝
Nd-Al bimetallic complex
Cyclization
Cyclized polyisoprene
Cyclopolymerization
Cationic species
