Temperature-induced phase separation and hydration in aqueous polymer solutions studied by NMR and IR spectroscopy: comparison of poly(N-vinylcaprolactam) and acrylamide-based polymers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F14%3A00425182" target="_blank" >RIV/61389013:_____/14:00425182 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/masy.201300002" target="_blank" >http://dx.doi.org/10.1002/masy.201300002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/masy.201300002" target="_blank" >10.1002/masy.201300002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature-induced phase separation and hydration in aqueous polymer solutions studied by NMR and IR spectroscopy: comparison of poly(N-vinylcaprolactam) and acrylamide-based polymers

Popis výsledku v původním jazyce

Using NMR and IR spectroscopy we compared the LCST behaviour of two types of thermoresponsive polymer systems, poly(N-vinylcaprolactam) (PVCL) and acrylamide-based polymers in aqueous solutions. We confirmed that during phase separation both PVCL and poly(N-isopropylmethacrylamide) (PNIPMAm) chains undergo coil-globule transition. At the same time some important differences were found for PVCL in comparison with PNIPMAm and poly(N-isopropylacrylamide) (PNIPAm), especially a much lower level of dehydration of PVCL segments at temperatures above the phase transition. We assume that the origin of these differences can be in different structure of respective monomer units. From time dependences of ATR FTIR spectra it follows that the low degree of dehydration of PVCL segments is not changed with time. Small increase in the wavenumbers of the Amide I components of the hydrated PVCL carbonyl groups with time indicates that water released from PVCL mesoglobules with time, as revealed from NMR

Název v anglickém jazyce

Temperature-induced phase separation and hydration in aqueous polymer solutions studied by NMR and IR spectroscopy: comparison of poly(N-vinylcaprolactam) and acrylamide-based polymers

Popis výsledku anglicky

Using NMR and IR spectroscopy we compared the LCST behaviour of two types of thermoresponsive polymer systems, poly(N-vinylcaprolactam) (PVCL) and acrylamide-based polymers in aqueous solutions. We confirmed that during phase separation both PVCL and poly(N-isopropylmethacrylamide) (PNIPMAm) chains undergo coil-globule transition. At the same time some important differences were found for PVCL in comparison with PNIPMAm and poly(N-isopropylacrylamide) (PNIPAm), especially a much lower level of dehydration of PVCL segments at temperatures above the phase transition. We assume that the origin of these differences can be in different structure of respective monomer units. From time dependences of ATR FTIR spectra it follows that the low degree of dehydration of PVCL segments is not changed with time. Small increase in the wavenumbers of the Amide I components of the hydrated PVCL carbonyl groups with time indicates that water released from PVCL mesoglobules with time, as revealed from NMR

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Macromolecular Symposia

ISSN

1022-1360

e-ISSN

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Svazek periodika

336

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

8

Strana od-do

39-46

Kód UT WoS článku

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EID výsledku v databázi Scopus

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