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Statements

Subject Item
n2:RIV%2F61389013%3A_____%2F14%3A00425182%21RIV14-GA0-61389013
rdf:type
n8:Vysledek skos:Concept
dcterms: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.
dcterms: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
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
skos:notation
RIV/61389013:_____/14:00425182!RIV14-GA0-61389013
n8:predkladatel
n17:ico%3A61389013
n3:aktivita
n12:P n12:I
n3:aktivity
I, P(GA202/09/1281)
n3:cisloPeriodika
1
n3:dodaniDat
n15:2014
n3:domaciTvurceVysledku
n6:5974518 n6:1518755
n3:druhVysledku
n9:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
49747
n3:idVysledku
RIV/61389013:_____/14:00425182
n3:jazykVysledku
n7:eng
n3:klicovaSlova
aqueous polymer solutions; FT-IR; NMR
n3:klicoveSlovo
n4:NMR n4:aqueous%20polymer%20solutions n4:FT-IR
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[F5FF295A8D86]
n3:nazevZdroje
Macromolecular Symposia
n3:obor
n13:CD
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n16:GA202%2F09%2F1281
n3:rokUplatneniVysledku
n15:2014
n3:svazekPeriodika
336
n3:tvurceVysledku
Spěváček, Jiří Dybal, Jiří
s:issn
1022-1360
s:numberOfPages
8
n19:doi
10.1002/masy.201300002