摘要
采用稀土催化体系Ｎｄ（Ｆ_３ＣＯ_２）_３－ＢｒＣ_５Ｈ_（１１）－Ｒ_ｍＡｌＨ_（３－ｍ）（Ｎｄ－Ｂｒ－Ａｌ），以甲苯为溶剂，在５０℃恒温水浴中进行苯乙烯（Ｓｔ）和异戊二烯（Ｉｐ）共聚合。结果表明，由Ａｌ（Ｏｃｔ）－３组成的催化体系可制备以顺式－１，４结构为主的共聚物；在后者组成的催化体系中，当Ａｌ／Ｎｄ＝５（摩尔比，下同），Ｂｒ／Ｎｄ＝５时，聚合活性最高。经ＩＲ，ＮＭＲ检测表征了共聚物的微观结构。同时，用π－烯丙基型配位机理和返扣配位机理对实验结果进行了定性解释。
The copolymerization of styrene (St) and isoprene(Ip) was carried out in a constant temperature bath of 50℃, using rare earth catalyst system Nd(CF_3O_2)_3-BrC_5H_(11)-R_mAlH_(3-m), with toluene as solvent. the results showed that the copolymer mainly containing cis-1,4structure was prepared using the catalyst system composed of Al(Oct)_3 of Al(i-Bu)_3·In the Al(i-Bu)_3 system, when Al/Nd=5(mol), Br/Nd=5 ( mol), the polymerization had the highest catalytic activity. The Structure of copolymer was characterized by IR and NMR.The sequence structure of copolymer was analyzed by ￣(13)C-NMR.
出处
《合成橡胶工业》
CSCD
北大核心
1994年第4期220-223,共4页
China Synthetic Rubber Industry
关键词
稀土催化剂
苯乙烯
异戊二烯
共聚
rare earthcatalyst
styrene
isoprene
copolymerization
microstructure
