Composite membrane with polyalkylene oxide modified polyamide surface
AssigneeThe Dow Chemical Company
InventorWilliam E. Mickols
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Abstract
A composite membrane and method for making the same, comprising a porous support and a crosslinked polyamide surface having polyalkylene oxide groups grafted thereto. The subject membrane provides improved resistance to fouling while offering excellent flux and salt passage performance. The subject method is easily adapted to commercial scale-up and does not require the use of chemical initiators.
Claims21
A method for modifying the surface of a composite membrane comprising a porous support and a crosslinked polyamide discriminating layer by chemically grafting polyalkylene oxide groups to the surface of the discriminating layer;
- wherein the polyalkylene oxide groups are the same or different and are represented by the formula:
- RO—(OCxHx+2)y—L—E
- wherein:
- x is the same or different and is 2 or 3;
- y is the same or different and is from about 2 to about 1000;
- R is the same or different and is selected from hydrogen, E, and an alkyl or alkenyl group having from 1 to 4 carbon atoms;
- L is the same or different and is selected from a linking bond or a linking group which is substantially non-reactive while the polyalkylene oxide group is chemically grafted to the discriminating layer;
- and
- E is the same or different and is selected from non-acrylate, electrophilic groups reactive with the functional groups present on the surface of the discriminating layer to form a covalent chemical bond therewith.
A composite membrane comprising a porous support and a crosslinked polyamide discriminating layer, wherein polyalkylene oxide groups represented by the formula provide below are chemically grafted to the surface of the discriminating layer;
- RO—(OCxHx+2)y—L—E
- wherein:
- x is the same or different and is 2 or 3;
- y is the same or different and is from about 2 to about 1000;
- R is the same or different and is selected from:
- hydrogen, E, and an alkyl or alkenyl group having from 1 to 4 carbon atoms;
- L is the same or different and is selected from:
- a linking bond or a linking group which is substantially non-reactive while the polyalkylene oxide group is chemically grafted to the discriminating layer;
- and
- E is the same or different and is selected from non-acrylate, electrophihic groups reactive with the functional groups present on the surface of the discriminating layer to form a covalent chemical bond therewith without the use of a chemical initiator.
Dependencies are inferred from the claim text.