US 12,233,383 B2
Fabrication of filtration membranes
Prity Bengani-Lutz, Woburn, MA (US); and Ayse Asatekin Alexiou, Arlington, MA (US)
Assigned to Trustees of Tufts College, Medford, MA (US)
Filed by Trustees of Tufts College, Medford, MA (US)
Filed on Jan. 12, 2024, as Appl. No. 18/411,289.
Application 18/411,289 is a division of application No. 16/346,590, granted, now 11,896,937, previously published as PCT/US2017/057517, filed on Oct. 20, 2017.
Claims priority of provisional application 62/416,340, filed on Nov. 2, 2016.
Prior Publication US 2024/0149225 A1, May 9, 2024
Int. Cl. B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/32 (2006.01); B01D 71/40 (2006.01); B01D 71/80 (2006.01); C08F 220/24 (2006.01); C08F 220/38 (2006.01)
CPC B01D 71/80 (2013.01) [B01D 67/0011 (2013.01); B01D 67/0016 (2013.01); B01D 67/0083 (2013.01); B01D 69/02 (2013.01); B01D 69/107 (2022.08); B01D 69/12 (2013.01); B01D 71/32 (2013.01); B01D 71/4011 (2022.08); C08F 220/24 (2013.01); B01D 2325/0283 (2022.08); B01D 2325/18 (2013.01); B01D 2325/20 (2013.01); C08F 220/387 (2020.02)] 10 Claims
 
1. A filtration membrane comprising:
a porous support layer; and
a polymeric layer coated onto the porous support layer, wherein the polymeric layer is formed by coating a copolymer solution formed by dissolving a statistical copolymer in a mixture of a co-solvent and an organic solvent on the porous support layer, wherein the polymer layer is coagulated on top of the porous support layer to form a thin film composite membrane and, wherein the co-solvent is ethyl ammonium nitrate and the organic solvent differs from the co-solvent,
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, and
wherein the membrane has an effective pore size of 0.5 to 5 nm and a water permeance of 10 Lm−2h−1bar−1 or higher.