Pervaporation of ethanol/water and benzene/cyclohexane mixtures using novel substituted polyacetylene membranes
ABSTRACT In the ethanol/water pervaporation using membranes of Si-containing polymers, poly[1-phenyl-2-(p-trimethylsilyl)phenylacetylene] and poly[1-β-naphthyl-2-(p-trimethylsilyl)phenylacetylene], these polymer membranes permeated ethanol preferentially; αEtOH/H2O 6.86 and 5.30, respectively, at 10 wt% EtOH content in the feed. Membranes of hydrocarbon-based polymers, poly(diphenylacetylene)
and poly(1-β-naphthyl-2-phenylacetylene), which were prepared by desilylation of the two Si-containing polymer membranes,
also exhibited ethanol permselectivity in ethanol/water pervaporation; αEtOH/H2O 5.95 and 3.79, respectively. Further, in benzene/cyclohexane pervaporation, these desilylated membranes, which were insoluble
in any organic solvent, showed rather low benzene permselectivity but very large fluxes. The results of the present study
are attributed to the presence of many microvoids and, in turn, sparse structures.