A method of preparing an amiphiphilic co-network comprising preparing a molecularly-bimodal crosslinkable amphiphilic graft by polymerizing a dihydrocarbylacrylamide monomer in the presence of a first asymmetric-telechelic polydihydrocarbylsiloxane monomer mixture and a second asymmetric-telechelic polydihydrocarbylsiloxane monomer mixture where the molar mass ratio between average molar mass of the first asymmetric-telechelic monomer mixture polydihydrocarbylsiloxane and average molar mass of the second asymmetric-telechelic monomer mixture polydihydrocarbylsiloxane is between 1:2 and 1:20; and crosslinking the molecularly-bimodal crosslinkable amphiphilic graft with a siloxane compound that includes at least two Si—H bonds.