Preparation of linear polyelectrolyte chains grafted porous membranes by plasma-initiated graft polymerization

摘要

Porous membranes grafted with long linear polyelectrolyte chains have aroused much attention because of their broad application prospect in both nanotechnology and biomaterials due to the strong electrostatic interaction within the polyelectrolyte chains. To prepare such membranes, plasma-initiated graft polymerization (PIGP) (Fig.1) is a promising method. It occurs on pore surface of porous membranes with little effect on the substrate's properties, which means high grafting density can be obtained while the bulk properties of substrate remain. However, as far as we know, it is difficult to prepare strongly dissociating polyelectrolyte grafted membranes directly by PIGP. In our research, we succeeded in grafting poly(2-Acrylamido-2-methylpropane sulfonic acid) (poly-AMPS) chains on porous high density polyethylene (HDPE) membranes by adding sodium dodecyl sulfate (SDS) to the monomer solution.