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Swelling equilibria for heterogeneous polyacrylamide gels
Author(s) -
Hino Toshiaki,
Prausnitz John M.
Publication year - 1996
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(19961205)62:10<1635::aid-app15>3.0.co;2-0
Subject(s) - polyacrylamide , monomer , acrylamide , swelling , copolymer , polymer chemistry , chemistry , polymer , materials science , chemical engineering , polymer science , organic chemistry , composite material , engineering
To correlate swelling equilibria for heterogeneous polyacrylamide gels in water to the monomer concentration at preparation, it is necessary to modify the classic Flory–Rehner theory. The necessary modification concerns the relation which links the number of segments between juction points to the monomer concentration at preparation; that relation is here adjusted empirically. Modified theory is compared to experimental swelling equilibria for polyacrylamide gels synthesized in water by free‐radical copolymerization of acrylamide (AAm) and N,N ′‐methylenebis(acrylamide) (BIS) at various monomer concentrations. Synthesis conditions studied are (1) different AAm‐to‐BIS ratios with fixed total monomer concentrations, (2) different total monomer concentrations with fixed AAm‐to‐BIS ratios, and (3) different AAm‐to‐BIS ratios with a fixed number of BIS moleculcs. The modified theory and experiment show good agreement. © 1996 John Wiley & Sons, Inc.