1994/05/01 by M. Kremer, Michael Kremer, Elmar Pothmann +7 · 1 citation
Biochemistry, Genetics and Molecular Biology · Chemistry · Materials Science · #Hydrogels: synthesis, properties, applications #Advanced Polymer Synthesis and Characterization #Polymer Nanocomposites and Properties
paper · doi:10.1021/ma00089a012
Pore-size distributions have been measured for cationic acrylamide-based hydrogels.We 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.We 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 MSEdata leads to the Fredholm integral equation that we solve numerically.'Results are reported for a series of hydro gels containing acrylamide and 3% MAPTAC; the hydrogels differed in extent of crosslinking and/or initial concentration of monomer.Pore-size distributions shift to lower pore sizes with rising initial 'monomer concentration and with rising crosslinker-to-monomer ratio.