Pore-size distributions of cationic polyacrylamide hydrogels varying in initial monomer concentration and cross-linker/monomer ratio

Journal Article · Mon May 23 00:00:00 EDT 1994 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00089a012· OSTI ID:7069900

Kremer, M; Pothmann, E; Roessler, T; Baker, J; Yee, A; Blanch, H; Prausnitz, J M ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

Pore-size distributions have been measured for cationic acrylamide-based hydrogels. The authors use the experimental mixed-solute-exclusion method, MSE (introduced by Kuga), to obtain the solute-exclusion curve representing the amount of imbibed liquid inside the gel inaccessible for a solute of radius r. The authors use the Brownian motion model (developed by Cassasa) to convert the size-exclusion curve into the pore-size distribution, which gives the frequency of pore radius R as a function of R. This theoretically-based interpretation of MSE data leads to the Fredholm integral equation that they solve numerically. Results are reported for a series of hydrogels containing acrylamide and 3% MAPTAC; the hydrogels differed in extent of cross-linking and/or initial concentration of monomer. Pore-size distributions shift to lower pore sizes with rising initial monomer concentration and with rising cross-linker-to-monomer ratio.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7069900
• Journal Information: Macromolecules; (United States), Vol. 27:11; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
MONOMERS
CROSS-LINKING
POLYAMIDES
PORE STRUCTURE
GELS
MATHEMATICAL MODELS
USES
CHEMICAL REACTIONS
COLLOIDS
DISPERSIONS
MICROSTRUCTURE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERIZATION
POLYMERS
400201* - Chemical & Physicochemical Properties
360602 - Other Materials- Structure & Phase Studies