苯乙烯-异戊二烯的渐变嵌段聚合物(Tapered block polymer)的链结构及其聚集态结构是令人感兴趣的,它是用两种竞聚率不同的单体同时投入共聚得到,这样的共聚物,单体单元的组成是连续变化的即苯乙烯(S)的摩尔分数从一端的1变到另一端的0,而异戊二烯(Ⅰ)的摩尔分数从一端0变到另一端的1。我们用同时投料的阴离子法合成了5个S和Ⅰ重量比为1:1,但总分子量不同的SI渐变嵌段聚合物,对其~(13)C NMR谱进行归属,在这基 The structure of the chain structure of the tapered block polymer of styrene-isoprene and its aggregation structure are of interest. It is obtained by simultaneously copolymerizing two monomers with different reactivity ratios, Such a copolymer has a monomer unit whose composition continuously varies, that is, the mole fraction of styrene (S) changes from one end to zero at the other end, while the mole fraction of isoprene (I) changes from one end 0 to The other end We synthesized five SI-tapered block polymers with S and I weight ratios of 1: 1, but different total molecular weights, using the simultaneous anionic method. The 13 C NMR spectra were assigned to this group