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Home  >  Journal list  >  Polymer Journal  >  Vol.20  No.9 (1988)  >  pp.785-790

Polymer Journal
<<Previous article Vol.20  No.9 (1988)   pp.785 - 790 Next article>>

Separation of H2 and CO through Poly(sulfone-amide) Membranes III. Changes of Gas Permeability and Membrane Structure in the Process of Solvent Removal

Yoshimitsu Sakaguchi1), Masaya Tokai1), Hiroshi Kawada1) and Yasuo Kato1)
1) Toyobo Research Center, Toyobo Co., Ltd.

ABSTRACT:  Slightly dried cast films of poly(sulfone-amide) synthesized from isophthaloyl dichloride and the mixed diamine which consisted of bis[4-(4-aminophenoxy)phenyl]sulfone and m-phenylenediamine (4:6) were thermally treated and the permeabilities of H2 and CO through them were measured. Though the permeability coefficient for H2 (PH2) was not affected by thermal treatment, the permeability coefficient for CO (PCO) decreased with increasing temperature of the thermal treatment. As a result, the permeability ratio for H2 relative to CO (PH2PCO) increased from 50 to 139, when the temperature of the thermal treatment was elevated from 30°C to 220°C. Changes of the membrane structure by thermal treatment were evaluated from measurements of density, thermomechanical analysis (TMA), thermogravimetric analysis (TG), and dynamic viscoelasticity. A decrease of a residual solvent in the membrane and a rearrangement of the polymer chains made the membrane structure more compact and increased PH2PCO.


Keyword:
Poly(sulfone-amide)/ Membrane/ Permeability/ Hydrogen/ Carbon Monoxide/ Diffusion/ Permeability Ratio/ Thermal Treatment/ Solvent/ Density

Published online: April 08, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan

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