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.

制备了三个具有不同组成的聚苯乙烯 - 多容二异苯二酚 - 块状聚酯，并通过同一分子上两个末端组之间的偶联反应进行了循环。通过GPC分馏，从偶联产物中分离出环形聚苯乙烯 - 块状聚酶。它们被臭氧化，以分解有选择性地指线性分子的聚利异丁烯块。根据ozonylysyscopt的分解产物的GPC分析，可以确定地证实，分级产品包括C.A. 90％的环分子。 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.