Stimuli-responsive polymers in solution investigated by NMR and infrared spectroscopy

0360533 - ÚMCH 2012 RIV DE eng J - Článek v odborném periodiku
Spěváček, Jiří - Dybal, Jiří
Stimuli-responsive polymers in solution investigated by NMR and infrared spectroscopy.
Macromolecular Symposia. Roč. 303, č. 1 (2011), s. 17-25. ISSN 1022-1360.
[International IUPAC Conference on Polymer-solvent Complexes and Intercalates /8./. Strasbourg, 05.07.2010-08.07.2010]
Grant CEP: GA ČR GA202/09/1281
Výzkumný záměr: CEZ:AV0Z40500505
Klíčová slova: aqueous solutions * infrared spectroscopy * NMR
Kód oboru RIV: CD - Makromolekulární chemie

Temperature-induced and solvent composition-induced phase separation in solutions of poly(N-isopropylmethacrylamide) (PIPMAm) and other thermoresponsive polymers as studied by NMR and infrared (IR) spectroscopy is discussed. The fraction p of phase-separated units (units with significantly reduced mobility) and subsequently, e.g., thermodynamic parameters characterizing the coil-globule phase transition induced by temperature, were determined from reduced integrated intensities in high-resolution 1H NMR spectra. This approach can be especially useful in investigations of phase separation in solutions of binary polymer systems. Information on behaviour of water during temperature-induced phase transition was obtained from measurements of 1H NMR relaxation times of HDO molecules. NMR and IR spectroscopy were used to investigate PIPMAm solutions in water/ethanol (D2O/EtOH) mixtures where the phase separation can be induced by solvent composition (cononsolvency).
Trvalý link: http://hdl.handle.net/11104/0198052