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Characteristics of permeation and separation for aqueous ethanol solutions through methyl methacrylate‐dimethylsiloxane graft copolymer membranes
Author(s) -
Miyata Takashi,
Takagi Toru,
Kadota Takeshi,
Uragami Tadashi
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960420
Subject(s) - pervaporation , permeation , copolymer , membrane , methyl methacrylate , aqueous solution , macromonomer , polymer chemistry , methacrylate , ethanol , chemistry , chemical engineering , materials science , organic chemistry , polymer , biochemistry , engineering
Poly(methyl methacrylate) with oligodimethylsiloxane grafts (MMA‐ g ‐DMS) was prepared by copolymerization of a dimethylsiloxane (DMS) macromonomer with methyl methacrylate (MMA). Two glass transition temperatures ( T g ) were observed at about 120°C and − 127°C and in all graft copolymer membranes. Transmission electron micrographs demonstrate that the MMA‐ g ‐DMS membranes show microphase separation. When an aqueous solution of 10 wt.‐% ethanol was applied to permeations through the MMA‐ g ‐DMS membranes by pervaporation, the ethanol concentration in the permeate and the permeation rate increased drastically with the DMS content in the copolymer. Especially, while at a DMS content of less than 40 mol‐% preferentially water permeates from an aqueous solution of 10 wt.‐% ethanol, the membranes with more than about 40 mol‐% of DMS show ethanol‐permselectivity. The relationship between the microphase‐separated structures and the permeation characteristics for an aqueous ethanol solution is discussed.