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In another embodiment, the rewettable asymmetric membrane after exposure to ultraviolet radiation can be exposed to a nonsolvent so that the copolymer can collect on the interstitial pores of the membrane. 488In one embodiment, the copolymer is the ethylene-vinyl alcohol copolymer. 489The rewettable asymmetric membrane after irradiation by the UV radiation source can be immersed in a nonsolvent such as water (e.g., water bath). 490The water as a nonsolvent can cause a portion of the ethylene-vinyl alcohol copolymer of the porous substrate to collect on the interstitial pores of the porous substrate. 491After exposure to the nonsolvent and collection of the ethylene-vinyl alcohol copolymer on the porous substrate, the rewettable asymmetric membrane can be dried. 492