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Behavior of water during temperature-induced phase separation in poly(vinyl methyl ether) aqueous solutions. NMR and optical microscopy study
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SYSNO ASEP 0358849 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Behavior of water during temperature-induced phase separation in poly(vinyl methyl ether) aqueous solutions. NMR and optical microscopy study Author(s) Spěváček, Jiří (UMCH-V) RID, ORCID
Hanyková, L. (CZ)
Labuta, J. (JP)Source Title Macromolecules. - : American Chemical Society - ISSN 0024-9297
Roč. 44, č. 7 (2011), s. 2149-2153Number of pages 5 s. Language eng - English Country US - United States Keywords phase separation ; poly(vinyl methyl ether) ; aqueous solution Subject RIV CD - Macromolecular Chemistry R&D Projects GA202/09/1281 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000289028500055 DOI 10.1021/ma200010h Annotation The behavior of water during the temperature-induced phase separation in PVME/D2O solutions was investigated by 1H NMR methods and optical microscopy. A fast exchange between water (HDO) bound in mesoglobules and free water was found from 1H NMR spin−spin relaxation measurements at temperature above the LCST transition for semidilute PVME/D2O solutions where the exchange time is 1.2 ms for c = 6 wt %. In contrast, there is a slow exchange between bound and free water in highly concentrated PVME solutions and the residence time of the bound water 2 s was found for concentrations c = 20−50 wt % using one-dimensional NOE 1H NMR experiment. A 3 order of magnitude slower exchange in highly concentrated PVME/D2O solutions is in accord with our optical microscopy findings that globular-like structures are here approximately 20 times larger than in PVME solution with c = 6 wt %. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2012
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