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Abnormal pH sensitivity of polyacrylate‐polyurethane hydrogels
Author(s) -
Ying Yan,
Gu Xuerong,
Yang Changzheng
Publication year - 1998
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/(sici)1097-4628(19981107)70:6<1047::aid-app1>3.0.co;2-o
Subject(s) - differential scanning calorimetry , polyurethane , swelling , self healing hydrogels , materials science , polymer chemistry , chemical engineering , chemistry , composite material , thermodynamics , physics , engineering
A series of polyacrylate–polyurethane networks (PUA) were synthesized and their pH‐sensitive behaviors were studied. An unexpected swelling–deswelling behavior was observed as the composition changed. Dynamic mechanical thermal analysis and differential scanning calorimetry were used to initially explain this phenomenon. By applying small‐angle X‐ray scattering and wide‐angle X‐ray diffraction simultaneously, a specific multiphase‐transition process could be clearly detected, which made the mechanism of the observed abnormal pH sensitivity more explicit. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 1047–1052, 1998