| Project/Area Number |
59470088
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性
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| Research Institution | MIE UNIVERSITY |
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Principal Investigator |
TAKAHASHI AKIRA FACULTY OF ENGINEERING, PROFESSOR Mie University, 工学部, 教授 (70023009)
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| Co-Investigator(Kenkyū-buntansha) |
KATO TADAYA FACULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (80023133)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 1986: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1985: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1984: ¥7,900,000 (Direct Cost: ¥7,900,000)
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| Keywords | Competitive Adsorption / Displacement Adsorption / Preferential Adsorption / Polystyrene / Poly(ethylene oxide) / Poly(methyl methacrylate) / 高分子電解質 |
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| Research Abstract |
Polymer adsorption behaviors are basically dominated by the energy of polymer segment-solid surface interaction. Therefore, whenever the polymer mixtures in solutions are come into contact with the solid surface of adsorbent, some competitive adsorption among these polymers occurs since the different kind of polymer has the different adsorption energy. In this work, the polymer adsorptions about various kinds of polymer combination were investigated to make clear the competitive adsorption behavior in further detail.
1. Polystyrene samples with different molecular weight adsorbed on to platinum surface under <THETA> condition. The thickness of adsorption layer was monitored by ellipsometry. The samples with higher molecular weight preferentially adsorbed over those with lower molecular weight. But, imcomplete displacement of smaller molecules by larger ones was also observed, in contrast with the behaviors in a good solvent system.
2. Competitive and displacement adsorption were studied under good solvent condition with two different polymer combinations: One was polystyrene(PS) /polyethylene oxide(PEO) and the other was PS/poly(methyl methacrylate) (PMMA). PEO and PMMA preferentially adsorb over PS and on adding the polymer displacers such as PEO and PMMA, PS was completely displaced by them.
3. In an aqueous solution system, a polyelectrolyte sample such as poly (4-vinyl-N,n-butylpyridiniumbromide) was also displaced from silica surface by PEO.
It is concluded that the preferential adsorption is caused by the difference of adsorption energy and the adsorption rule, that is, larger molecules preferentially adsorb over smaller ones, becomes a dominant factor even when competitive and displacement adsorption occurs.
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