NMR study of phase separation in D2O/ethanol solutions of poly(N-isopropylmethacrylamide) induced by solvent composition and temperature |
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| Authors: | Hana Kou?ilová Ji?í Spěvá?ek |
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| Institution: | a Faculty of Mathematics and Physics, Charles University, VHolešovi?kách 2, 180 00 Prague 8, Czech Republic
b Institute of Macromolecular Chemistry AS CR, v.v.i., 162 06 Prague 6, Czech Republic |
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| Abstract: | 1H and 13C NMR spectroscopies were applied to investigate phase separation in solutions of poly(N-isopropylmethacrylamide) (PIPMAm) in D2O/ethanol (EtOH) mixtures induced by solvent composition (cononsolvency) and temperature. Effects of EtOH content in D2O/EtOH mixtures and temperature on the appearance and extent of the phase separation were characterized. Differences in mesoglobules formed during the phase separation induced by cononsolvency and temperature were found. For temperature-induced phase separation, 13C spin-spin relaxation times showed that besides the free EtOH expelled from the PIPMAm mesoglobules, there are also EtOH molecules bound in these mesoglobules. On the other hand, virtually no bound EtOH molecules were detected for mesoglobules formed as a consequence of the cononsolvency. For PIPMAm random copolymers containing negatively charged methacrylate units the phase separation induced by solvent composition was not observed. |
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| Keywords: | Poly(N-isopropylmethacrylamide)/D2O/ethanol solutions Phase separation Cononsolvency 1H and 13C NMR spectroscopy |
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