Porous membranes

Details Porous membranes Porous membranes

C - Chemistry, Metallurgy

08

J

18/15

C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 69/08 (2006.01) B29C 47/20 (2006.01) D01D 5/24 (2006.01)

Patent

CA 2002798

A method of making a porous polymeric material by heating a mixture of a thermoplastic polymer and a cationic or non-ionic surfactant having a hydrophilic-lipophilic balance range of 4.0 to 6.0 to a temperature and for a time sufficient for the polymer and surfactant to mutually dissolve. The mixture is then cooled to a temperature so that non-equilibrium liquid-liquid phase separation takes place to form a bi-continuous matrix of the polymer and surfactant so that the polymer and surfactant form two intermingled separate phases of large interfacial surface area. The surfactant. is then removed from the polymer. The porous polymeric material produced by the above method has a lacey or filamentous structure consisting of a plurality of polymer strands connected together at spaced apart locations along each strand.

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