2013 Fiscal Year Final Research Report
Dynamic Control of Slide-Ring Materials
| Project/Area Number |
20221005
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nanomaterials/Nanobioscience
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ITO Kohzo 東京大学, 新領域創成科学研究科, 教授 (00232439)
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| Co-Investigator(Kenkyū-buntansha) |
URAYAMA Kenji 京都工芸繊維大学, 工芸科学研究科, 教授 (20263147)
YOKOYAMA Hideakihideaki 東京大学, 大学院新領域創成科学研究科, 准教授 (80358316)
SAKAI Yasuhiro 東京大学, 大学院新領域創成科学研究科, 助教 (30401235)
KIDOWAKI Masatoshi 芝浦工業大学, 工学部, 准教授 (80401230)
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| Co-Investigator(Renkei-kenkyūsha) |
SHIMOMURA Takeshi 東京農工大学, 工学研究科, 教授 (40292768)
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| Project Period (FY) |
2008-05-12 – 2013-03-31
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| Keywords | 高分子 / 超分子 / 力学物性 / エントロピー / 力学物性 / 動的物性 / 架橋 |
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| Research Abstract |
We investigated the dynamics of slide-ring materials with movable cross-links, focusing on the correlation between the ability of molecular sliding and the macroscopic mechanical properties. We established a versatile synthesis of polyrotaxanes, which are the precursors of slide-ring materials, to diversify the molecular structures of the backbone polymers and ring components. We revealed that the materials generally exhibit a peculiar viscoelastic relaxation attributed to the chain sliding through the cross-links. The relaxation time is strongly dependent on the molecular structures of backbones and rings, indicating that the macroscopic mechanical response can be controlled by the design of polyrotaxanes that affects the slidability. In addition, we proposed a novel concept of entropic elasticity generated by sliding rings to explain various peculiar properties of slide-ring materials successfully.
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