Abstract
In order to improve surface property of poly[1-(trimethylsilyl)-1-propyne] (PTMSP) membranes, surface-modified PTMSP membranes were prepared by adding a small amount of a polymer additive, which is a graft copolymer PFA- g-PDMS, consisting of poly(fluoroacrylate) (PFA) and poly(dimethylsiloxane) (PDMS), in a casting solution of PTMSP. Contact angles for water on air and glass plate sides in the preparation of surface-modified PTMSP membranes were significantly different and those on the air side were more hydrophobic, and the contact angles for water increased with increasing additional amount of PFA- g-PDMS. High hydrophobicity of the membrane surface on the air-side and the increase in hydrophobicity with an increase of the additional amount of polymer additive were also confirmed by X-ray photoelectron spectroscopy. The permeation rate for an aqueous solution of 10 wt% ethanol in pervaporation of the surface-modified PTMSP membranes decreased slightly but ethanol permselectivity increased considerably with the increase of the additional amount of PFA- g-PDMS.
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