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Preparation and gas separation performance of silicone‐coated polysulfone membranes
Author(s) -
Marchese José,
Ochoa Nelio,
Pagliero Cecilia
Publication year - 1995
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280630405
Subject(s) - polysulfone , silicone rubber , membrane , permeation , scanning electron microscope , gas separation , porosity , materials science , silicone , chemical engineering , polymer , coating , polymer chemistry , permeability (electromagnetism) , composite material , chemistry , biochemistry , engineering
Composite membranes (CM) were prepared by coating the dense surface of different asymmetric polysulfone flat membranes (AM) with a solution of silicone rubber polymer. The surface porosity (ε) of the dense skin AM samples varied between 4 × 10 −5 and 1·5 × 10 −8 , with an average mean pore size between 0·10 and 0·07 μm. Scanning electron microscopy (SEM), gas permeation experiments (H 2 , N 2 , CH 4 , CO 2 ) and a simple resistance model were used for the determination of structure‐permeability relationships. This study indicates that the CM prepared with polysulfone AM having ε < 3 × 10 −7 , coated with a concentration of 6% silicone solution and a contact time of 1 min, has the best gas separation performance, with selectivities very close to the intrinsic polysulfone selectivities.