Orientation of Oxygen-permeable Ultrathin Membrane Prepared by Spreading Solutions of Silicone Copolymer on Water Surface

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  • 水面展開法による酸素透過性シリコーン共重合体超薄膜の配向性
  • スイメン テンカイホウ ニ ヨル サンソ トウカセイ シリコーン キョウジュウ

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Abstract

A ultrathin membrane with high oxygen permeability was prepared from a crosslinked ternary copolymer [poly-(hydroxystyrene)-poly(dimethylsiloxane)-polysulfone: abbreviated as HS copolymer]. The membrane was produced by spreading the dilute solutions on water surface (abbreviated as SW method). The configuration of the membrane was investigated by comparing with those of a monolayer and a multilayer of HS copolymer. From the surface pressure-area isotherm measurements, it was suggested that a monolayer of HS copolymer on the surface of water has a configuration in which hydrophobic dimethylsiloxane segment is emersed and hydrophilic segment is immersed in water. The monolayers were deposited on a glass substrate or porous polypropylene film by horizontal lifting method lifted from either water side or air side. Measurements of XPS and the water contact angle (θ) for the surface showed that the configuration of the monolayer is retained even in the multilayer. The values of θ of the membrane by SW method was in fair agreement with the values of the multilayer lifted from water side and air side. Oxygen permeability coefficient was measured as 9.2×10-2 (cm3/10.17 cm2.s.atm) and selectivity (O2/N2) as 2.02 for above membrane. Similar values were obtained for multilayer composed of more than 6 layers. These results indicate that the ultrathin membrane by SW method has the same orientation as a multilayer. No specific permeable behavior was observed in the membrane though it has the surface oriented structure.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1987 (11), 2045-2051, 1987-11-10

    The Chemical Society of Japan

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