Block copolymer membranes and associated methods for making the same

A separation matrix comprising:

• a porous surface layer;
• and
• a bulk porous support, wherein both the porous surface layer and the bulk porous support comprise a self-assembling block copolymer having a polydispersity index in a range from about 2 to about 5,
• wherein the block copolymer comprises A-B or A-B-A repeating units,
• wherein A and B, at each occurrence, are two different blocks comprising an oligomer or a polymer, and
• wherein a structural unit of block A is derived from one or more atom transfer radical polymerization (ATRP)-active monomer or oligomer comprising one or more acrylates, methacrylates, acrylamides, methacrylamides, styrenics, vinyl pyridines, acrylonitriles, or a combination thereof and
• a structural unit of block B is derived from a thermoplastic ATRP-active macroinitiator of structure IV, V or VI: