Abstract: Compositions and cross-linked polymer networks including at least one soft fluoropolymer segment and at least one hard fluorinated polymer segment which are covalently bonded through a linking moiety are provided. Methods of making the compositions and networks, and devices that incorporate them are also provided. The polymer networks may be designed to exhibit specific mechanical or physical properties which are tunable through by synthetic techniques including variation in the number and/or identity of the hard fluorinated polymer segments and soft fluoropolymer segments.