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Temperature‐responsive properties of poly(acrylic acid‐ co ‐acrylamide)‐ graft ‐oligo(ethylene glycol) hydrogels
Author(s) -
Kubota Naoji,
Tatsumoto Nobuhide,
Sano Takayuki,
Matsukawa Yoshiaki
Publication year - 2001
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 - 10.1002/1097-4628(20010502)80:5<798::aid-app1157>3.0.co;2-s
Subject(s) - ethylene glycol , self healing hydrogels , polymer chemistry , acrylic acid , acrylamide , lower critical solution temperature , swelling , molar mass , polymer , acrylic resin , chemistry , transition temperature , materials science , chemical engineering , monomer , copolymer , organic chemistry , composite material , coating , superconductivity , physics , quantum mechanics , engineering
A series of temperature‐ and pH‐responsive hydrogels were prepared from acrylic acid (AAc), acrylamide (AAm), oligo(ethylene glycol)monoacrylate (OEGMA), and oligo(ethylene glycol)diacrylate by varying the AAc:AAm molar ratio and the OEGMA content. Phase‐transition temperatures and swelling ratios of the obtained poly(AAc‐ co ‐AAm)‐ graft ‐OEG gels were measured as a function of temperature and pH. At pH < 5, the obvious transition temperatures ranging from 5 to 35°C were obtained as the AAc : AAm molar ratio was varied. The highest transition temperature was obtained at the AAc : AAm ratios of 5 : 5 and 6 : 4, and the sharp transition curves were observed at the AAc : AAm ratios from 5 : 5 to 8 : 2. The transition temperature further increased with increasing OEGMA content. It was suggested that OEG graft chains with a large mobility played an important role for the formation of hydrogen bonding in the hydrogels. The gels prepared here showed obvious reproducibility of the phase transition in response to temperature changes, which suggests the feasibility of their practical applications. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 798–805, 2001