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Phase behavior of N ‐isopropylacrylamide/acrylic acid copolymer hydrogels prepared with ultrasound
Author(s) -
Seida Yoshimi,
Takeshita Kenji,
Nakano Yoshio
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12932
Subject(s) - self healing hydrogels , copolymer , acrylic acid , swelling , hysteresis , materials science , poly(n isopropylacrylamide) , polymer chemistry , chemical engineering , phase (matter) , chemistry , composite material , polymer , organic chemistry , physics , quantum mechanics , engineering
N ‐Isopropylacrylamide/acrylic acid copolymer hydrogels were synthesized with ultrasound. The thermoresponsive phase behaviors of gels synthesized with ultrasound (US gels) were investigated and compared with those of gels synthesized in the absence of ultrasound (FR gels). The US gels showed thermoresponsive swelling behavior with a large hysteresis over a wide range of temperatures around its phase‐transition temperature. The hysteresis became larger with an increasing copolymerized acrylic acid content. The US gels were also characterized from the viewpoint of chemical, hydration, and macroscopic physical structures. Little difference was observed in the chemical and hydration structures of the FR gels and US gels. The macroscopic physical structure of the US gels was, however, distinct from that of the FR gels. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2449–2452, 2003