Preparation, Characterization of Cyclic Block Copolymers and Their Bulk Structures

环状嵌段共聚物的制备、表征及其本体结构

• 批准号: 12450383
• 负责人: MATSUSHITA Yushu
• 金额: $ 9.47万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450383/
• 关键词: Cyclic Polymer; Block Copolymer; Morphology; Conformation; Anionic Polymerization; Ozonolysis

Three polystyrene-block-polyisoprene-block-polystyrenes with different compositions were prepared and cyclized by the coupling reaction between two end groups on the same molecules. Ring-shaped polystyrene-block-polyisoprenes were isolated from the coupling products by GPC fractionation. They were ozonized so as to decompose the polylyisoprene blocks selectively referring to the linear molecule. From GPC analysis of the decomposed products obtained by ozonolysis, it was quantitatively confirmed that the fractionated products include c.a. 90% ring molecules. It has been found that the morphological transition of the ring-shaped block copolymers takes place depending 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.

制备了三种不同组成的聚苯乙烯-嵌段-聚异戊二烯-嵌段-聚苯乙烯，并通过同一分子上两个端基之间的偶联反应进行环化。通过 GPC 分级从偶联产物中分离出环状聚苯乙烯-嵌段-聚异戊二烯。将它们臭氧化以选择性地分解线性分子的聚异戊二烯嵌段。从通过臭氧分解获得的分解产物的GPC分析，定量地证实了分馏产物包括大约10％的产物。 90%为环状分子。已经发现，环形嵌段共聚物的形态转变取决于组成，以与线性三嵌段共聚物基本相同的方式发生，而SI环形嵌段共聚物的域间距均小于SI环形嵌段共聚物的域间距。相应的SIS线性三嵌段共聚物，其归因于环链构象。