Patent ID: 8028842

Claim:
A method of making a hydrophilic-hydrophobic random copolymer water purification membrane comprising the steps of : forming a hydrophilic-hydrophobic random copolymer comprising one or more hydrophilic monomers comprising a sulfonated polyarylsulfone monomer and a second monomer and one or more hydrophobic monomers comprising a non-sulfonated third monomer and a fourth monomer, wherein the sulfonated polyarylsulfone monomer introduces a sulfonate into the hydrophilic-hydrophobic random copolymer; and forming the hydrophilic-hydrophobic random copolymer into a hydrophilic-hydrophobic random copolymer water purification membrane for use in a water purification system, wherein the sulfonated polyarylsulfone monomer comprises a disulfonated-diphenylsulfone, the second monomer comprises a biphenol, the non-sulfonated third monomer comprises a 4, 4′-difluoro-triphenyl phosphine oxide, and the fourth monomer comprises a biphenol.