| Project/Area Number |
06651048
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
SHIMADA Shigetaka Nagoya Institute of Technology・Faculty of Technology・Associate Professor, 工学部, 助教授 (20024309)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Monodisperse Polystirene / Porous Silica / Adsorption / Interaction with Silica / Graft Copolymerization / Poly (ethylene oxide) / Molecular Motion / Electron Spin Resonance |
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| Research Abstract |
Spin-label method is used to study structure and molecular motion of polystirene (PS) chains having molecular weights, Mw=3X10^3,9.6X10^4, and 3.8X10^5, adsorbed in a pore of porous silica and the silica suface grafted with poly (ethylene oxide) (PEO).
(1)The adsorption rate and the amount of the adsorbed PS depend on the grafting ratio lower than 2%.
(2)The molecular interaction between PS and silica and the molecular motion of PS chain depend on its molecular weight. The adsorped PS having Mw=3X10^3 strongly interacts with silica, whereas PS having Mw=9.6X10^4 and 3.8X10^5 moves rapidly as "tail or loop segment" at a short adsorption decreases its mobility with increasing adsorption time, and change to "train segment".
(3)Molecular mobility of the grafted PEO chain is higher than the adsoroed PS chain, having Mw=3.8X10^5. This fact suggests that the PS chains spread out the grafted chains and adsrbed on the silica surface as "train segments", whereas PEO chains protrude as "tail segmens". It was also found that the molecular structure of the chains change with adsorption time. Their structure of PEO and PS depend on molecular weight of PS and grafting ratio of PEO.
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