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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

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

CEP obor

CD - Makromolekulární chemie

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

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Polymer Bulletin

ISSN

0170-0839

e-ISSN

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Svazek periodika

70

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

15

Strana od-do

221-235

Kód UT WoS článku

000313059800017

EID výsledku v databázi Scopus

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