Hydrophobic polymeric membrane composites

Details Hydrophobic polymeric membrane composites Hydrophobic polymeric membrane composites

1993-05-17

1994-02-15

Foelak, Morton

Liquid purification or separation

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Supported, shaped or superimposed formed mediums

21050042, 21050041, 427244, 427245, 427508, 4283066, 4283157, 4283197, 521 53, 521 57, 521134, 521138, B01D 2900

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active

052863824

ABSTRACT:
A composite porous membrane is formed from a porous polymeric substrate having its entire surface modified with a cross-linked polymer which results in a hydrophobic and oleophobic surface. The composite membrane retains substantially all of its other original properties. The cross-linked polymer is formed in situ on the polymeric substrate from a reactant system comprising an ethylenically unsaturated monomer having at least one fluoroalkyl group, a cross-linker, and, if needed, a polymerization initiator, dissolved in a nonpolar and or weakly polar solvent system. The membrane substrate saturated with the reactant system is exposed to a suitable energy source to effect polymerization and cross linking of the monomer.

REFERENCES:
patent: 4954256 (1990-09-01), Degen et al.

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