NMR Study of Thermoresponsive Block Copolymer in Aqueous Solution

Temperature behavior of D2O solutions of poly(ethylene oxide) (PEO)114‐block‐poly(N‐isopropylacrylamide) (PNIPAm)109 is characterized by NMR methods. At temperatures above the lower critical solution temperature (LCST) transition of PNIPAm component, 1H NMR spectra are consistent with existence of m...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2016-06, Vol.217 (12), p.1370-1375
Main Authors: Spvacek, Jirí, Konefa, Rafa, Cadova, Eva
Format: Article
Language:English
Subjects:
Aqueous solutions
Block copolymers
Blocking
Copolymers
Micelles
NMR
NOESY
Nuclear magnetic resonance
Overhauser effect
poly(ethylene oxide)-block-poly(N-isopropylacrylamide) block copolymers
Spectra
Spectroscopy
Spectrum analysis
stimuli-sensitive polymers
Temperature
Two dimensional
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Summary:Temperature behavior of D2O solutions of poly(ethylene oxide) (PEO)114‐block‐poly(N‐isopropylacrylamide) (PNIPAm)109 is characterized by NMR methods. At temperatures above the lower critical solution temperature (LCST) transition of PNIPAm component, 1H NMR spectra are consistent with existence of micelles where immobilized PNIPAm blocks form rather compact core and mobile PEO blocks form a shell of micelles. The transition of PNIPAm component shifts toward lower temperatures with increasing polymer concentration. 2D nuclear Overhauser effect spectroscopy spectra which can provide information on proton groups in close spatial contact (
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201600025