About: 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

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About: 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 Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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 T2 measurements, might be mainly indirectly bound water. 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 T2 measurements, might be mainly indirectly bound water. (en)
Title	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 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 (en)
skos:prefLabel	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 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 (en)
skos:notation	RIV/61389013:_____/14:00425182!RIV14-GA0-61389013
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA202/09/1281)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Dybal, Jiří Spěváček, Jiří
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	49747
http://linked.open...ai/riv/idVysledku	RIV/61389013:_____/14:00425182
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	aqueous polymer solutions; FT-IR; NMR (en)
http://linked.open.../riv/klicoveSlovo	NMR FT-IR aqueous polymer solutions
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[F5FF295A8D86]
http://linked.open...i/riv/nazevZdroje	Macromolecular Symposia
http://linked.open...in/vavai/riv/obor	CD
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Stimuli-responsive multicomponent polymer systems in aqueous solutions and gels investigated by NMR and other methods
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	336
http://linked.open...iv/tvurceVysledku	Dybal, Jiří Spěváček, Jiří
issn	1022-1360
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1002/masy.201300002

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