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Deswelling characteristics of poly( N ‐isopropylacrylamide) hydrogel
Author(s) -
Park Tae Gwan,
Hoffman Allan S.
Publication year - 1994
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.1994.070520110
Subject(s) - lower critical solution temperature , poly(n isopropylacrylamide) , aqueous solution , polymer chemistry , materials science , chemical engineering , kinetics , swelling , chemistry , polymer , composite material , copolymer , physics , quantum mechanics , engineering
Poly( N ‐isopropylacrylamide) gels exhibit a lower critical solution temperature (LCST) behavior in aqueous solution. At temperatures below the LCST, the gel is more hydrated than at temperatures above the LCST. At the LCST, the volume change is sharp. It is shown here that the water content of the gel above the LCST depends upon previous states of the gel (e.g., dry or wet), the heating rate, and the gel thickness. Deswelling kinetics are also affected by the gel thickness. Caffeine release experiments indicate that microscopic water pockets are formed within the matrix during the rapid gel collapse procedure. © 1994 John Wiley & Sons, Inc.