DC Field | Value | Language |
---|---|---|
dc.contributor.author | S. K. Kang | ko |
dc.contributor.author | M.S. Jhon | ko |
dc.date.accessioned | 2013-02-25T02:46:13Z | - |
dc.date.available | 2013-02-25T02:46:13Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1993-01 | - |
dc.identifier.citation | MACROMOLECULES, v.26, no.1, pp.171 - 176 | - |
dc.identifier.issn | 0024-9297 | - |
dc.identifier.uri | http://hdl.handle.net/10203/59218 | - |
dc.description.abstract | Na-23, Cl-35, and K-39 line widths and chemical shifts were studied for amphoteric copolymer hydrogel systems as a function of water content and 1 N NaCl and 1 N KCl solution contents. A rapid decrease of the Na-23 line width and a downfield shift of the resonance appeared in the range between 1 and 6 water molecules per sodium ion. These results show that the counterions in the sodium methacrylate-co-(N,N-dimethylamino)ethyl methacrylate (MAANa-co-DMAMA) hydrogel establish a contact ion pairing with the polyions. The data suggest the presence of 5 or 6 water molecules in the first hydration sphere of sodium and potassium as counterions. The line shape of Na-23 and K-39 NMR between 6 and 15 water molecules per counterion shows the non-Lorentzian character. Also the chemical shift amove down field, and the correlation time remains at a constant value. The results in the range show that the relaxation rate and chemical shift of counterions in the MAA-co-DMAMA hydrogel mainly depend on the change of electric field gradients occurring at the anisotropic hydrated counterion around the polyion and the hydrogen bonding between the -COO- groups and the hydrated ion species, respectively. The Cl-35 relaxation rate of the systems MAANa-co-DMAMA. HCI and MAAK-co-DMAMA.HCl in a 1 N NaCl solution is markedly decreased when free water is produced. This result shows that the Cl-35 relaxation is strongly affected by the mobility of water molecules in this system. | - |
dc.language | English | - |
dc.publisher | Amer Chemical Soc | - |
dc.subject | AQUEOUS-SOLUTIONS | - |
dc.subject | BINDING | - |
dc.subject | NMR | - |
dc.subject | RELAXATION | - |
dc.subject | NA+ | - |
dc.title | IONIC MOBILITY AND CONTACT ION-PAIRING STUDY BY NA-23, CL-35, AND K-39 NUCLEAR-MAGNETIC-RESONANCE IN A POLY[METHACRYLIC ACID-CO-(N,N-DIMETHYLAMINO)ETHYL METHACRYLATE] HYDROGEL | - |
dc.type | Article | - |
dc.identifier.wosid | A1993KF72600027 | - |
dc.identifier.scopusid | 2-s2.0-0027908185 | - |
dc.type.rims | ART | - |
dc.citation.volume | 26 | - |
dc.citation.issue | 1 | - |
dc.citation.beginningpage | 171 | - |
dc.citation.endingpage | 176 | - |
dc.citation.publicationname | MACROMOLECULES | - |
dc.contributor.nonIdAuthor | S. K. Kang | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | AQUEOUS-SOLUTIONS | - |
dc.subject.keywordPlus | BINDING | - |
dc.subject.keywordPlus | NMR | - |
dc.subject.keywordPlus | RELAXATION | - |
dc.subject.keywordPlus | NA+ | - |
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