Thermal transitions of poly(N-isopropylmethacrylamide) in aqueous solutions |
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Authors: | M. Salmeró n Sá nchez,L. Hanyková ,M. Monleó n Pradas |
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Affiliation: | a Center for Biomaterials, Universidad Politécnica de Valencia, Camino de Vera s/n, E-46071 Valencia, Spain b Faculty of Mathematics and Physics, Charles University, V Holešovi?kách 2, 18000 Prague 8, Czech Republic c Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 16206 Prague 6, Czech Republic |
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Abstract: | Thermal transitions of poly(N-isopropylmethacrylamide) (PIPMAm) in aqueous solutions were studied in a wide temperature range from −100 to 60 °C. The solutions of different polymer weight fractions (c=0.03-1) were investigated in cooling and heating scans of differential scanning calorimetry; four qualitatively different kinds of thermograms were identified in dependence of the fraction, c. The transitions are explained in a thermodynamic framework based on the phase diagram of the system. This diagram provides a complete understanding of thermal transitions in aqueous PIPMAm solutions as a function of c, in particular the existence of non-crystallizable water and the temperature induced phase transition that is due to the hydrophobic interaction in PIPMAm solutions. |
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Keywords: | Temperature induced transition PIPMAm DSC |
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