Porous Membranes Including Triblock Copolymers

A method of preparing a porous membrane, the method comprising:

• forming a film or a hollow fiber from a solution, the solution comprising a solvent and solids comprising an ABC triblock copolymer;
• removing at least a portion of the solvent from the film or the hollow fiber;
• and
• contacting the film or the hollow fiber with a nonsolvent, thereby forming the porous membrane comprising a plurality of pores;
• forming the porous membrane comprising a plurality of pores;
• wherein the A block has a Tg of 90 degrees Celsius or greater and is present in an amount ranging from 30% to 80% by weight, inclusive, of the total block copolymer;
• wherein the B block has a Tg of 25 degrees Celsius or less and is present in an amount ranging from 10% to 40% by weight, inclusive, of the total block copolymer and
• wherein the C block is a water miscible hydrogen-bonding block immiscible with each of the A block and the B block.