摘要
以Co(naph)_2-Al_2Et_3Cl_3为催化剂,研究了丁二烯-苯乙烯(Bd-St)共聚合中三种聚合溶剂的影响。实验发现,单用环己烷和抽余油配制陈化液并作聚合溶剂,先聚合物形成;如以少量甲苯配制陈化液,再以环己烷或抽余油作聚合溶剂,催化活性不高;只有当陈化和聚合均在甲苯中进行时,催化剂才能获得高活性。实验还测定了Bd/St(mol比)<1、聚合物收率<10％时共聚物的组成,用YBR法求得20℃时Bd和St的竞聚率分别为6.13和0.13。
The effects of three types of solvents , toluene , cyclohexane and extracted oil , on the copolymerization of butadiene (Bd) and styrene (St) were studied , using Co(naph)2-Al2Et3Cl3 as catalyst .It was found that when cyclohexane or extracted oil was used alone for preparing aged catalyst solution and as polymerization solvent , no polymer was formed . When a small amount of toluene was used for preparing aged catalyst solution , then cyclohexane or extracted oil was used as polymerization solvent , low catalyst activity was obtained . Only when toluene was used for both preparing aged catalyst solution and as polymerization solvent ,high catalyst activity could be obtained .The copolymers composition was determined under the conditions of Bd St (molar ratio) < 1, and copolymer yield < 10% . The reactivity ratios of Bd and St at 20°C were determined by YBR method , being 6.13 and 0.13 , respectively .
出处
《合成橡胶工业》
CAS
CSCD
北大核心
1991年第1期30-33,共4页
China Synthetic Rubber Industry
基金
国家自然科学基金
关键词
丁二烯
苯乙烯
共聚
溶剂
竞聚率
cobalt Ziegler - Natta catalyst
butadiene
styrene
high cis- 1,4-butadiene-styrene copolymer
solvent
reactivity ratio
