Membrane, Method For Manufacturing The Same, And Composite Membrane Including The Same

A method of manufacturing a membrane including a skin layer and a porous layer, a thickness ratio of the skin layer relative to the porous layer being about 0.01 or less, the skin layer having a thickness of 1 μm or less, the method comprising:

• preparing an organic solution including about 5 wt % to about 30 wt % of a polyacrylonitrile-based copolymer, about 1 wt % to about 10 wt % of a pore-forming agent, and about 60 wt % to about 94 wt % of an organic solvent, the polyacrylonitrile-based copolymer including at least one selected from a hydrophobic side chain and a hydrophobic repeating unit;
• applying the organic solution to a substrate to form an applied substrate;
• and
• dipping the applied substrate in a non-solvent.