Swelling equilibria for heterogeneous polyacrylamide gels

✍ Scribed by Toshiaki Hino; John M. Prausnitz

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 413 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961205)62:10<1635::aid-app15>3.0.co;2-0

✦ Synopsis

SYNOPSIS

T o correlate swelling equilibria for heterogeneous polyacrylamide gels in water to the monomer concentration a t preparation, it is necessary to modify the classic Flory-Rehner theory. The necessary modification concerns the relation which links the number of segments between junction 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(acry1amide) (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 molecules. The modified theory and experiment show good agreement. 0 1996 John Wiley & Sons, Inc.