Chemical valves based on poly(4-vinylpyridine)-filled microporous membranes

Microporous membranes containing poly(4-vinylpyridine) anchored within the pores exhibit very large chemical valve effects with pressure-driven permeability changing by more than three orders of magnitude as a function of pH. The factors affecting the magnitude of this valve have been examined with a series of well characterized, poly(4-vinylpyridine)-modified, microporous polypropylene membranes. The permeability of these membranes to HCl/H2O …