(EN)
Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.
(ZH) 公开了制备偶联的苯乙烯嵌段共聚物的方法的改进,其中在聚合之中或之后,以每当量活性聚合物链端计,添加约0.01-约1.5当量的金属烷基化合物到胶浆中,从而改进偶联效率。所得星形苯乙烯嵌段共聚物具有降低含量的5+臂低聚物,这在一些应用,如改性沥青中,是非常理想的。