A graft copolymer including zwitterionic repeat units and hydrophobic repeat units, in which the zwitterionic repeat units constitute 2-60 wt % of the graft copolymer and each of the hydrophobic repeat units is characterized in that a homopolymer formed thereof is miscible with polyvinylidene fluoride, polysulfone, poly ether sulfone, polyvinyl chloride, or polyacrylonitrile, each of the hydrophobic repeat units not being a repeat unit of polyvinylidene fluoride. Also disclosed is a filtration membrane containing such a graft copolymer or a statistical copolymer that includes the same composition of repeat units as the graft copolymer. Further disclosed are methods of preparing the graft copolymer and the filtration membrane.

A sterile solution product bag includes sterilization grade filter integrated directly into the product bag such that microbial and particulate matter filtration can be performed using the filter directly at the point of fill. The filter can include a hollow fiber filter membrane contained in a stem connected to a bladder of the product bag.

A composite semipermeable membrane includes a porous support membrane, a separation functional layer containing a polyamide disposed on the porous support membrane, and a coating layer disposed on the separation functional layer, wherein a water contact angle of a surface of the coating layer is 40° or less, and a protein adsorption force of the surface of the coating layer is 0.4 nN or less.

A zwitterionic polysulfone formed from an allyl-containing monomer, a phenol-containing monomer, and an aryl-halide-containing monomer. The zwitterionic polysulfone may be incorporated into a desalination membrane.

A graft copolymer including zwitterionic repeat units and hydrophobic repeat units, in which the zwitterionic repeat units constitute 2-60 wt % of the graft copolymer and each of the hydrophobic repeat units is characterized in that a homopolymer formed thereof is miscible with polyvinylidene fluoride, polysulfone, poly ether sulfone, polyvinyl chloride, or polyacrylonitrile, each of the hydrophobic repeat units not being a repeat unit of polyvinylidene fluoride. Also disclosed is a filtration membrane containing such a graft copolymer or a statistical copolymer that includes the same composition of repeat units as the graft copolymer. Further disclosed are methods of preparing the graft copolymer and the filtration membrane.

A zwitterionic polysulfone formed from an allyl-containing monomer, a phenol-containing monomer, and an aryl-halide-containing monomer. The zwitterionic polysulfone may be incorporated into a desalination membrane.

The present invention pertains to composition suitable for manufacturing membranes based on vinylidene fluoride (VDF) polymers, to porous membranes thereof, to methods for their manufacture and to uses thereof, especially for the filtration of water phases. Said composition comprising vinylidene fluoride (VDF) polymers and polymer additives comprising zwitterionic moieties delivers outstanding hydrophilization performances of manufactured membranes.

Charge mosaic membranes useful for desalination applications, and methods of making and using the same, are described.

A method of separating a mixture of fluids may comprise contacting an absorbent material with a mixture of fluids comprising a first fluid and a second fluid having different polarities, wherein the absorbent material selectively absorbs the first fluid to provide a permeate comprising the first fluid and a retentate comprising the second fluid. The absorbent material comprises a zwitterionic polymer, the zwitterionic polymer being a polymerization product of reactants comprising a zwitterionic monomer and a (meth)acrylate crosslinker. The zwitterionic monomer is selected from the group consisting of: a zwitterionic monomer of Formula I, R—(CH.sub.2).sub.m—NR′.sub.2.sup.+—(CH.sub.2).sub.n-A.sup.−, wherein R is selected from a carboxyamide, a (meth)acrylate, and an alkyl; m is an integer of from 0 to 5; each R′ is independently selected from hydrogen and an alkyl; n is an integer of from 1 to 5; and A.sup.− is SO.sub.3.sup.− or CO.sub.2.sup.−; a zwitterionic monomer of Formula II, R—(CH.sub.2).sub.m-A.sup.−-(CH.sub.2).sub.n—NR′.sub.3.sup.+, wherein R is an (meth)acrylate; m is an integer of from 1 to 5; A is PO.sub.4.sup.−; n is an integer of from 1 to 5; and each R′ is independently selected from hydrogen and an alkyl; carboxybetaine diacrylamide; (3-methacryloylamino-propyl)-(2-carboxy-ethyl)-dimethylammonium; 3-[Dimethyl-(2-hydroxyethyl)ammonio]-1-propanesulfonate; 1-methylpyridinium 3-sulfonate; and combinations thereof.

Disclosed herein is an ion selective separation membrane including: a metal organic framework layer formed on, in, and/or around a substrate, the metal organic framework having a crystal structure that includes a first surface and a second surface and includes ion transport channels formed between respective pore windows in the first surface and the second surface; first and second electrodes to apply a potential difference across the membrane; wherein the respective pore windows have a pore size that is less than the hydrated diameter of the ion for which the ion selective separation membrane is selective.