引言 以碱金属及其有机金属化合物,特别是锂及烷基锂(LiR)所引发的阴离子聚合反应,已研究得较为透彻。用LiR引发丁二烯(Bd)与苯乙烯(St)共聚,形成的是以大量Bd与少量St的共聚链段和St链段所构成的嵌段共聚物。为了得到无规程度较高和1,2-结构含量较低的丁苯胶,曾提出了多种改进方法。例如,改进合成工艺,控制 Introduction Anionic polymerization initiated with alkali metals and their organometallic compounds, particularly lithium and lithium alkyls (LiR), has been studied quite thoroughly. The copolymerization of butadiene (Bd) with styrene (St) with LiR initiated the formation of a block copolymer consisting of a large amount of Bd and a small amount of St copolymerization and St blocks. In order to obtain a higher degree of randomness and lower 1,2-structure of SBR, have proposed a variety of improved methods. For example, to improve the synthesis process, control