1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F13%3A00388069" target="_blank" >RIV/61389013:_____/13:00388069 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s00289-012-0831-x" target="_blank" >http://dx.doi.org/10.1007/s00289-012-0831-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00289-012-0831-x" target="_blank" >10.1007/s00289-012-0831-x</a>

Result language

angličtina

Original language name

1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures

Original language description

1H NMR spectroscopy was used to investigate the temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) (PIPMAm/PVCL) mixtures to find out if the phase transition of the given component (PIPMAm or PVCL) is affected by the presence of the second component. Our results that PVCL and PIPMAm transitions are in polymer mixtures shifted by 2 K towards higher temperatures in comparison with neat polymers and depend on polymer concentration show that such effect exists. Spin?spin relaxation times of water (HDO) indicate that in solutions with c 1 wt% a portion of water is predominantly bound in PVCL mesoglobules even at temperatures above the LCST transition of PIPMAm component. Water is with timereleased from these mesoglobules without any induction period so indicating that it is mostly indirectly bound water. We assume that there is a direct connection between character of the bound water and the transition temperatures.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CD - Macromolecular chemistry

OECD FORD branch

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Project

<a href="/en/project/GA202%2F09%2F1281" target="_blank" >GA202/09/1281: Stimuli-responsive multicomponent polymer systems in aqueous solutions and gels investigated by NMR and other methods</a><br>

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2013

Confidentiality

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

Name of the periodical

Polymer Bulletin

ISSN

0170-0839

e-ISSN

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Volume of the periodical

70

Issue of the periodical within the volume

1

Country of publishing house

DE - GERMANY

Number of pages

15

Pages from-to

221-235

UT code for WoS article

000313059800017

EID of the result in the Scopus database

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