| Project/Area Number |
14350496
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
TSUJII Yoshinobu Kyoto Univ., Inst.Chem.Res., Associate Professor, 化学研究所, 助教授 (00217308)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Takeshi Kyoto Univ., Inst.Chem.Res., Professor, 化学研究所, 教授 (00111972)
OHNO Khoji Kyoto Univ., Inst.Chem.Res., Instructor, 化学研究所, 助手 (00335217)
GOTO Atsushi Kyoto Univ., Inst.Chem.Res., Instructor, 化学研究所, 助手 (20335219)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥16,900,000 (Direct Cost: ¥16,900,000)
Fiscal Year 2004: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2003: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2002: ¥8,700,000 (Direct Cost: ¥8,700,000)
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| Keywords | Polymer brush / Concentrated brush / Graft polymerization / Living radical polymerization / Surface / Triboligy / 原子間力顕微鏡 / 反発力 / 摩擦力 / エントロピー弾性 / 浸透圧 / 中性子反射率測定 / 相溶性 / 重水素化ポリメタクリル酸メチル / グラフト密度 / 高分子ブラシ / 電解質高分子 / 膨潤特性 / 解離度 / ヘミアセタールエステル / 原子移動ラジカル重合 |
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| Research Abstract |
Recent successful application of living radical polymerization made it possible to graft various low-polydispersity polymers with exceptionally high graft densities. In this study, the structure and properties of such obtained concentrated polymer brushes were systematically investigated in a swollen and dry state. The most striking result concerns their tribological properties in a good solvent : the frictional coefficient (μ) between concentrated PMMA brushes was dramatically lower than that between the semi-dilute brushes, which was reasonably ascribed to little interpenetration of swollen concentrated polymer brushes due to the large osmotic pressure and highly stretched conformation (entropic interaction). The obtained μ value is one of the lowest values comparable to that achieved for polyelectrolyte semi-dilute brushes with the help of a charge effect. This study would provide a new concept toward precision surface modification for "super" lubrication.
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