Polyaniline Membranes for Separation Applications

摘要

High quality membranes of poly aniline/ethylaniline copolymers along withpolyaniline/polyimide blends have been synthesized. Water permeates preferentially over organic (such as acetic acid) through doped poly aniline due to a combination of favorable diffusion and solubility. Fully doped polyaniline is among the most selective membranes yet developed for water/acetic acid separations: e.g. at 50% water/50% acetic acid the selectivity alpha is > 1,000. Fully doped poly aniline membranes are highly selective effectively blocking species with diameters greater than or equal 4.5 Angstroms. In addition to traditional dopants, ion implantation has been found to be an effective method to produce very highly conductive poly aniline films which exhibit metallic-like behavior.