| Project/Area Number |
14103015
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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 |
高分子合成
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| Research Institution | Osaka University |
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Principal Investigator |
HARADA Akira Osaka University, Graduate School of Science, Professor, 大学院理学研究科, 教授 (80127282)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Hiroyasu Osaka University, Graduate School of Science, Assistant Professor, 大学院理学研究科, 助手 (00314352)
TAKASHIMA Yoshinori Osaka University, Graduate School of Science, Assistant Professor, 大学院理学研究科, 助手 (40379277)
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| Project Period (FY) |
2002 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥114,660,000 (Direct Cost: ¥88,200,000、Indirect Cost: ¥26,460,000)
Fiscal Year 2006: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
Fiscal Year 2005: ¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2004: ¥30,290,000 (Direct Cost: ¥23,300,000、Indirect Cost: ¥6,990,000)
Fiscal Year 2003: ¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2002: ¥30,810,000 (Direct Cost: ¥23,700,000、Indirect Cost: ¥7,110,000)
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| Keywords | Molecular Recognition / Inclusion / Supramolecular Polymer / Cyclodextrin / Rotaxane / Gel / Self-Assembly / Dynamics / 開環重合 / ポリエステル / シャペロン / 超分子化学 / 包接化合物 / らせん超分子 / ホストーゲスト化学 / ポリロタキサン / 超分子 / らせん / ポリロタキ / ホスト-ゲスト / ホスト分子 / ゲスト分子 / ラセン / チオフェン / ポリチオフェン / 導電性高分子 / 包接重合 |
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| Research Abstract |
1.Construction of Supramolecular Polymers
When a guest part was covalently attached to cyclodextrin (CD), they formed supramolecular dimers, a cyclic daisy chain, supramolecular oligomers, and polymers. t-Boc-cinnamamide-α-CD was found to form chiral supramolecular polymers in aqueous solutions. Supramolecular poly[2]rotaxane polymers and supramolecular α-, β-CD copolymers were obtained.
2.Dymanics of Supramolecular Polymers
We investigated a new one-pot method to prepare polyrotaxanes containing γ-CDs by the photocyclodimerization reactions of 9-anthryl groups at the ends of the polymer chain in the presence of γ-CDs.
We have constructed pseudo-rotaxanes of α-CD with axle molecules bearing pyridyl end caps via kinetic control of threading of α-CD onto axle molecules. A single substituted pyridyl group attached to the ends of the axle molecule regulated the rate for α-CD passing them. Two methyl substituents could govern the degree of complex formation of a-CD with guest molecules and resu
… More
lted in the distinction of face direction of CD molecules entering the axle ends. α-CDs were arranged in one direction at two station units of the axle molecule.
Poly(ethylene glycol) (PEG)-substituted CDs with different chain lengths have been synthesized. PEG-substituted CDs formed self-threading complexes in aqueous solutions, and the conformational exchange dynamics between self-threading and dethreading could be regulated by its chain length.
3.Polymerization of lactones
CDs were found to initiate ring-opening polymerization of some cyclic esters selectively to give a polyester with a CD at the chain end.
4.Gel-to-Sol and Sol-to-Gel Transitions
Using molecular recognition of α-CD, we have successfully constructed a photoresponsive hydrogel system by combination of simple components, α-CD, dodecyl-modified poly(acrylic acid), and a photoresponsive competitive guest, 4,4'-azodibenzoic acid. Gel-to-sol and sol-to-gel transitions occurred repeatedly by repetitive irradiations of UV and visible light. Less
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