Fabrication of filtration membranes
AssigneeTrustees of Tufts College
InventorsPrity Bengani-Lutz, Ayse Asatekin Alexiou
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Abstract
Disclosed is a method of preparing a filtration membrane. The method includes providing a copolymer solution by dissolving a statistical copolymer in a mixture of a co-solvent and a first organic solvent, coating the copolymer solution onto a porous support layer to form a polymeric layer thereon, coagulating the polymeric layer on top of the support layer to form a thin film composite membrane, and immersing the thin film composite membrane into a water bath to obtain a filtration membrane. Also disclosed are a filtration membrane prepared by the method, and a process of filtering a liquid using the filtration membrane thus prepared.
Claims10
A method of preparing a filtration membrane, comprising:
- providing a copolymer solution by dissolving a statistical copolymer in a mixture of a co-solvent and an organic solvent, wherein the co-solvent is ethyl ammonium nitrate;
- and the organic solvent differs from the co-solvent;
- coating the copolymer solution onto a porous support layer to form a polymeric layer thereon;
- coagulating the polymeric layer to afford a thin film composite membrane;
- and
- immersing the thin film composite membrane into a water bath to obtain a filtration membrane;
- wherein the copolymer solution comprises the statistical copolymer at 1 to 99 w/v %, the co-solvent at 5 to 49 v/v %, and the organic solvent at 51 to 95 v/v %;
- the statistical copolymer comprises zwitterionic repeat units and hydrophobic repeat units,
- wherein the zwitterionic repeat units constitute 30-50% by weight of the statistical copolymer, the hydrophobic repeat units constitute 50-70% by weight of the statistical copolymer;
- and the statistical copolymer is selected from the group consisting of poly((trifluoroethyl methacrylate)-r-(sulfobetaine methacrylate)), poly((methyl methacrylate)-r-(sulfobetaine methacrylate)), poly((trifluoroethyl methacrylate)-r-(3-(2-vinylpyridinium-1-yl)propane-1-sulfonate)), poly((trifluoroethyl methacrylate)-r-(phosphorylcholine methacrylate), or poly((trifluoroethyl methacrylate)-r-(3-(2-vinylpyridinium-1-yl)butane-1-sulfonate));
- and
- the co-solvent is miscible with both water and the organic solvent.
A method of preparing a filtration membrane, comprising:
- providing a copolymer solution by dissolving a statistical copolymer in a mixture of a co-solvent and an organic solvent, wherein the co-solvent is ethyl ammonium nitrate;
- and the organic solvent differs from the co-solvent;
- coating the copolymer solution onto a porous support layer to form a polymeric layer thereon;
- coagulating the polymeric layer to afford a thin film composite membrane;
- and
- immersing the thin film composite membrane into a water bath to obtain a filtration membrane, wherein the copolymer solution comprises the statistical copolymer at 1 to 99 w/v %, the co-solvent at 5 to 49 v/v %, and the organic solvent at 51 to 95 v/v %;
- and
- the statistical copolymer comprises zwitterionic repeat units and hydrophobic repeat units, wherein the zwitterionic repeat units constitute 30-50% by weight of the statistical copolymer, the hydrophobic repeat units constitute 50-70% by weight of the statistical copolymer, the statistical copolymer is poly((trifluoroethyl methacrylate)-r-(sulfobetaine methacrylate)), and the first organic solvent is ethanol.
Dependencies are inferred from the claim text.