Patent ID: 11896937
Assignee: TRUSTEES OF TUFTS COLLEGE
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. 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.