2002 Fiscal Year Final Research Report Summary
Preparation, Characterization of Cyclic Block Copolymers and Their Bulk Structures
| Project/Area Number |
12450383
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Nagoya University |
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Principal Investigator |
MATSUSHITA Yushu Nagoya University Graduate School of Engineering, Department of Applied Chemistry, Professor, 工学研究科, 教授 (60157302)
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| Co-Investigator(Kenkyū-buntansha) |
TORIKAI Naoya High Energy Accelerator Research Organization, Neutron Science Laboratory, Research Associate, 物質構造科学研究所, 助手 (70300671)
TAKANO Atsushi Nagoya University Graduate School of Engineering, Department of Applied Chemistry, Lecturer, 工学研究科, 講師 (00236241)
OHTANI Hajime Nagoya University Graduate School of Engineering, Department of Applied Chemistry, Associate Professor, 工学研究科, 助教授 (50176921)
TAKAHASHI Yoshiaki Kyushu University Interdisciplinary Graduate School of Engineering Sciences, Associate Professor, 理工科学研究院, 助教授 (40188066)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Cyclic Polymer / Block Copolymer / Morphology / Conformation / Anionic Polymerization / Ozonolysis |
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| Research Abstract |
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.
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