Asymmetric membranes

摘要

- 32 Asymmetric membranes comprising a first asymmetric porous zone 37 including a first porous asymmetry that increases from the first exterior surface 32 through the first porous zone 35 of the bulk 34, and a second asymmetric porous zone 38 including a second porous asymmetry that increases from the second exterior surface 33 through the second porous zone 36 of the bulk 34, wherein the first average pore size is larger than the second average pore size, as well as methods of making and using the membranes, are disclosed.