Patent ID: 8476385

Claim:
A polymer or oligomer comprising at least one first divalent unit represented by formula: wherein each Rf is independently selected from the group consisting of: Rf a —(O) t —CHF—(CF 2 ) n —; [Rf a —(O) t —C(L)H—CF 2 —O] m —W—; CF 3 CFH—O—(CF 2 ) p —; and CF 3 —O—(CF 2 ) 3 —(OCF(CF 3 )—CF 2 ), z —O-L 1 -; each Q is independently selected from the group consisting of a bond, —C(O)—N(R 1 )—, and —C(O)—O—; each X is independently selected from the group consisting of alkylene and arylalkylene, wherein alkylene and arylalkylene are each optionally interrupted by at least one ether linkage and optionally terminated by —N(R 1 )—C(O)— or —O—C(O)—; R and R 1 are each independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms; Rf a represents a partially or fully fluorinated alkyl group having from 1 to 10 carbon atoms and optionally interrupted with at least one oxygen atom; L is selected from the group consisting of F and CF 3 ; W is selected from the group consisting of alkylene and arylene; L 1 is selected from the group consisting of —CF 2 —, —CF 2 CF 2 —, and —CF(CF 3 )—; t is 0 or 1, wherein when Rf is represented by formula Rf a —(O) t —CHF—(CF 2 ) n — and t is 0, then Rf a is interrupted with at least one oxygen atom; m is 1, 2, or 3; n is 0 or 1; each p is independently an integer from 1 to 6; and z is an integer from 0 to 3.