Gas separation articles composed of amorphous fluorinated copolymers of dioxolanes and other fluorinated ring monomers and methods of making and using thereof

A separation article comprising an amorphous crosslinked fluorinated copolymer comprising both a fluorinated dioxolane ring unit and a fluorinated non-dioxolane ring unit, wherein the amorphous fluorinated copolymer is selectively permeable to a targeted gaseous component present in a gaseous mixture comprising the targeted gaseous component and one or more other gaseous components,

• wherein the amorphous crosslinked fluorinated copolymer is produced by (a) copolymerizing a one or more fluorinated dioxolane ring monomers in an amount of 1 mol % to 99.5 mol %, and a one or more fluorinated non-dioxolane ring monomers in an amount of 1 mol % to 99.5 mol %, and a crosslinker in the amount of from 0.2 mol % to 20 mol % to produce a first copolymer and (b) crosslinking the first copolymer to produce the amorphous fluorinated crosslinked fluoropolymer.