caa a22 4500 475763432 CHVBK 20180406123558.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/s003969900231 doi (NATIONALLICENCE)springer-10.1007/s003969900231 Effects of acrylic acid incorporation on the pressure-temperature behavior and the calorimetric properties of poly( N -isopropylacrylamide) in aqueous solutions [Elektronische Daten] [Y. Yamazaki, T. Tada, S. Kunugi]  We studied the effects of pH on the pressure-temperature dependence of coil-collapse transition for aqueous solutions of copolymers of N-isopropylacrylamide and acrylic acid (Ac). At low pressures, the transition temperature (T tr) increased with pressure, but T tr decrease with increasing pressure at pressures higher than 50-100 MPa. By increasing the pH, the transition contour shifted to a higher temperature. When the Ac content was increased, the effects of pH became more evident. From a calorimetric study at atmospheric pressure, ΔH tr was found to become smaller by increasing the portion of the ionized residues in the copolymer. The ratio to the van't Hoff enthalpy changes became larger with an increase in pH, which indicated that the production of charge decreased the cooperative domain size. Springer-Verlag Berlin Heidelberg, 2000 Key words Poly(N-isopropylacrylamide) nationallicence Poly(acrylic acid) nationallicence Cloud point nationallicence Thermoresponsive polymer nationallicence High pressure nationallicence Yamazaki Y. Department of Polymer Science and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo Kyoto 606-8585, Japan, JP aut Tada T. Department of Polymer Science and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo Kyoto 606-8585, Japan, JP aut Kunugi S. Department of Polymer Science and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo Kyoto 606-8585, Japan, JP aut https://doi.org/10.1007/s003969900231 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003969900231 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamazaki Y. Department of Polymer Science and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo Kyoto 606-8585, Japan, JP aut NATIONALLICENCE 700 1- Tada T. Department of Polymer Science and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo Kyoto 606-8585, Japan, JP aut NATIONALLICENCE 700 1- Kunugi S. Department of Polymer Science and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo Kyoto 606-8585, Japan, JP aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer