Premium
Hydrophobic association and temperature and pH sensitivity of hydrophobically modified poly( N ‐isopropylacrylamide/acrylic acid) gels
Author(s) -
Tian Qin,
Zhao Xian,
Tang Xiaozhen,
Zhang Yunxiang
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.12122
Subject(s) - comonomer , acrylic acid , polymer chemistry , hydrophobe , acrylate , swelling , copolymer , self healing hydrogels , poly(n isopropylacrylamide) , chemistry , ethyl acrylate , fluorocarbon , lower critical solution temperature , materials science , chemical engineering , organic chemistry , polymer , biochemistry , composite material , engineering
Hydrophobically modified poly(acrylic acid/ N ‐isopropylacrylamide) gels were synthesized by the radical copolymerization of acrylic acid/ N ‐isopropylacrylamide with a small amount of the hydrophobic comonomer 2‐( N ‐ethylperfluorooctanesulfoamido)ethyl acrylate, stearyl acrylate, or lauryl acrylate in tert ‐butanol with ethylene glycol dimethacrylate as a crosslinker. Swelling kinetics and fluorescence measurements showed that the hydrophobic association ability of fluorocarbon groups was stronger than that of hydrocarbon analogues in modified hydrogels that contained both physical and chemical crosslinking networks. The effects of the fractions and the species of the hydrophobe on the gel swelling and pH and temperature sensitivity were studied. The results indicated that the swelling behavior and pH and temperature sensitivity of the gels were affected by the degree of hydrophobic modification. A hydrogel with a suitable 2‐( N ‐ethylperfluorooctanesulfoamido)ethyl acrylate content (0.349 mol %) showed good pH and temperature sensitivity. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 2406–2413, 2003