2006 Fiscal Year Final Research Report Summary
Amphiphilic alternating polymide vesicles : elucidation of the formation mechanism and its application.
| Project/Area Number |
17550113
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KUDO Kazuaki The University of Tokyo, Institute of Industrial Science, Associate Professor, 生産技術研究所, 助教授 (80251669)
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| Project Period (FY) |
2005 – 2006
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| Keywords | amphiphilic polymer / alternating polymer / polyimide / structure-property relationship / vesicle |
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| Research Abstract |
ReI[1S,5R,6S]-3-Oxabicyclo[3.2.1] octane-2,4-dione-6-spiro-3'-(tetrahydrofuran-2',5'-dione) (DAn), a dianhydride having a unique regioselectivity upon reaction with aromatic amines, was sequentially treated with each 0.5 equiv. of hydrophilic and hydrophobic diamines to give a variety of amphiphilic alternating copolyimides. Dynamic light scattering analysis of their aqueous solutions revealed that 1) the size of aggregate of alternating copolyimides is considerably larger than that of random copolyimides, and 2) the size depends on the alkyl chain length in the side chain. Vesicle formation was confirmed by means of TEM observation.
However, the degree of imidization was around 70-80%. This low value was considered to be problematic for the precise evaluation of aggregating behavior. Then, the conditions for the imidization reaction was examined in detail, and it was found that chemical imidization gave better results. The molecular weight of the copolyimides were around several thousands, but later we found that it can be increased up to >20000. It is highly needed that a set of polyimides having different degree of imidization and different molecular weights should be systematically investigated.
Meanwhile, on the way of this research, we happened to find that the copoly(amide acid)s, a synthetic precursor for the copolyimides, also shows aggregating behavior in a certain conditions. A relationship was found between the molecular structure and the size of the aggregates. This research was extended to the development of photoresponsive macromolecular aggregates.
It is highly expected that the result of the present research will lead to the development of novel amphiphilic copolyimide/copoly(amide acid)-based materials.
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Research Products
(5 results)
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[Book] 有機機能材料2006
Author(s)
荒木孝二, 明石 満, 高原 淳, 工藤一秋
Total Pages
238
Publisher
東京化学同人
Description
「研究成果報告書概要(和文)」より
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