A compound comprising Formula 2A, 2B, or 2C (Ra—O—CO—)2YFormula 2A Ra—O—CO—Y—CO—O—(CH2CH2)RfFormula 2B Ra—O—CO—Y—CO—O—RFormula 2C wherein Ra is the group (i) Rf(CH2CF2)d—(CgH2g)—; (ii) RfOCF2CF2—(CgH2g)—; (iii) Rf OCFHCF2O(CH2CH2O)v—(CgH2g)—; (iv) RfOCFHCF2O(CwH2w)—; (v) RfOCF(CF3)CONH—(CgH2g)—; or (vi) Rf(CH2)h[(CF2CF2)i(CH2CH2)j]k; each Rf is independently CcF(2c+1); c is 2 to about 6; d is 1 to about 3; g is 1 to 4; v is 1 to about 4; w is from about 3 to about 12; h is 1 to about 6; i, j, and k are each independently 1, 2, or 3, or a mixture thereof; provided that the total number of carbon atoms in group (vi) is from about 8 to about 22; Y is a linear or branched diradical having olefinic unsaturation of the formula —CeH(2e-2)— wherein e is 2 or 3; R is H or a linear or branched alkyl group CbH(2b+1)—; and b is from 1 to about 18.