Preparation and Morphology of Ring-Shaped Polystyrene-<i>b</i><i>lock</i>-polyisoprenes
作者:Atsushi Takano、Osamu Kadoi、Kazuhiro Hirahara、Seiichi Kawahara、Yoshinobu Isono、Jiro Suzuki、Yushu Matsushita
DOI:10.1021/ma021357l
日期:2003.5.1
fractionated products include ca. 90% ring molecules. The morphological transition of the ring-shaped block copolymers depends on composition in essentially the same manner as that of the linear triblock copolymers, whereas the domain spacings of SI ring-shaped block copolymers were all smaller than those of the corresponding SIS linear triblock copolymers, which is attributed to looped chain conformation
三个聚苯乙烯-嵌段-polyisoprene-块-polystyrenes(SIS)用不同的组合物来制备,并通过在同一分子上的两个末端基团之间的偶联反应进行环化。环状聚苯乙烯嵌段通过GPC分级分离从偶联产物中分离出-聚异戊二烯(SI)。为了使聚异戊二烯嵌段选择性地分解为线性分子,将它们臭氧化。通过臭氧分解获得的分解产物的GPC分析定量证实了分馏产物中约有。90%的环状分子。环状嵌段共聚物的形态转变基本上取决于与线性三嵌段共聚物相同的组成,而SI环状嵌段共聚物的域间距都小于相应的SIS线性三嵌段共聚物的域间距,这归因于环状链构象。