Behavior of Water during Temperature-Induced Phase Separation in Poly(vinyl methyl ether) Aqueous Solutions. NMR and Optical Microscopy Study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F11%3A10105160" target="_blank" >RIV/00216208:11320/11:10105160 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389013:_____/11:00358849

Výsledek na webu

<a href="http://dx.doi.org/10.1021/ma200010h" target="_blank" >http://dx.doi.org/10.1021/ma200010h</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/ma200010h" target="_blank" >10.1021/ma200010h</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Behavior of Water during Temperature-Induced Phase Separation in Poly(vinyl methyl ether) Aqueous Solutions. NMR and Optical Microscopy Study

Popis výsledku v původním jazyce

The behaviour 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 three orders of magnitude slower exchange in highly concentrated PVME/D2O solutions is in accord with our optical microscopy findings that globular-like structures are here approx. 20 times larger than in PVME solution with c = 6 wt%.

Název v anglickém jazyce

Behavior of Water during Temperature-Induced Phase Separation in Poly(vinyl methyl ether) Aqueous Solutions. NMR and Optical Microscopy Study

Popis výsledku anglicky

The behaviour 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 three orders of magnitude slower exchange in highly concentrated PVME/D2O solutions is in accord with our optical microscopy findings that globular-like structures are here approx. 20 times larger than in PVME solution with c = 6 wt%.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GA202%2F09%2F1281" target="_blank" >GA202/09/1281: Na podněty reagující vícesložkové polymerní systémy ve vodných roztocích a gelech studované pomocí NMR a dalších metod</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Macromolecules

ISSN

0024-9297

e-ISSN

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Svazek periodika

44

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

2149-2153

Kód UT WoS článku

000289028500055

EID výsledku v databázi Scopus

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