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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 effect of three polymerization solvents in the copolymerization of butadiene-styrene (Bd-St) was investigated using Co (naph) _2-Al_2Et_3Cl_3 as catalyst. The experiment found that the use of cyclohexane and raffinate oil preparation of aging liquid and polymerization solvent, the first polymer to form; such as a small amount of toluene preparation of aging liquid, and then cyclohexane or raffinate polymerization solvent, catalytic activity Not high; catalysts are only highly active when both aging and polymerization are carried out in toluene. The experiment also determined the composition of copolymers with Bd / St (mol ratio) <1 and polymer yield <10%. The recovery ratios of Bd and St at 20 ℃ were 6.13 and 0.13, respectively.