Pore-filled nanofiltration membranes based on poly(2-acrylamido-2-methylpropanesulfonic acid) gels

摘要: Abstract Strong polyacid gel-filled membranes have been prepared by UV-initiated copolymerization of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and N , ′-methylenebisacrylamide within the pores a microporous polypropylene (PP) substrate. These poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) were readily with predictable amounts incorporated gel polymer (mass gain, MG) provided that threshold values degree cross-linking monomer concentration exceeded. Most showed large dimensional changes, particularly in their thickness on incorporation PAMPS. changes related to amount PAMPS into membranes. In order determine volume fractions gels, partial specific (0.575 cm 3 /g) was obtained from density measurements using pycnometry. As result increase (volume) membranes, pore-filling gels limited between 0.01 0.06, relatively low compared achieved other based same The Darcy permeability exhibits typical relationship fraction, but absolute are much lower than those previously studied. could be attributed tightly bound water molecules along chains, which effectively enlarges hydrodynamic size chains narrows channels for transport. Using sphere model Odijk's theory semidilute polyelectrolyte solutions, calculated good precision.