Swelling equilibria for ionized temperature-sensitive gels in water and in aqueous salt solutions

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458039· OSTI ID:6952212

Beltran, S; Hooper, H H; Blanch, H W; Prausnitz, J M ^[1]

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1. Chemical Engineering Department, University of California, Berkeley, CA (US) Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (US)

Swelling equilibrium data in water and in aqueous NaCl solutions are presented for thermally sensitive N-isopropylacrylamide (NIPA) hydrogels containing 0--4 mol % quaternized amine (positively ionizable) comonomer. We report the effect of gel charge and solution ionic strength on the temperature-induced collapse of NIPA gels. Experimental swelling equilibria are compared with predictions based on a recently proposed oriented-quasichemical model. This model has been shown previously to describe lower critical solution behavior in {ital uncharged} aqueous polymer solutions and gels (i.e., aqueous NIPA gel). We apply the model here to {ital ionized} NIPA gel. Semiquantative predictions are obtained for the effects of gel charge and solution ionic strength on temperature-dependent swelling behavior.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6952212
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:3; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
ACRYLAMIDE
ALKALI METAL COMPOUNDS
AMIDES
AQUEOUS SOLUTIONS
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
GELS
HALIDES
HALOGEN COMPOUNDS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PHASE TRANSFORMATIONS
POLYMERS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
SWELLING
TEMPERATURE DEPENDENCE