TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: (IA) is (2-((3-difluoromethyl-1,2,2,3-tetrafluoro-4-methyl-cyclopentyl)-difluoro-methoxy)-1,1,2,2-tetrafluoro-ethanesulfonyl fluoride. (IB) is 2-((3-difluoromethyl-2,2,3-trifluoro-cyclohexyl)-difluoro-methoxy)-1,1,2,2-tetrafluoro-ethanesulfonyl fluoride. (IC) is 2-(difluoro-(2,2,3,4,4,6,6-heptafluoro-5-methyl-cyclohexyl)-methoxy)-1,1,2,2-tetrafluoro-ethanesulfonyl fluoride. (I) is a copolymer comprising at least one repeat units derived from a comonomer comprising tetrafluoroethylene (optionally substituted), hexafluoropropylene, vinylidene fluoride, perfluoro(methyl vinyl ether), perfluoro(propyl vinyl ether), methyl vinyl ether, propylene, ethylene, chlorotrifluoroethylene, perfluoro(2,2-dimethyl-1,3-dioxole), methyl vinyl ether, ethylene or propylene.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): Preparation of (I) comprises free-radical polymerization of fluoroalkyl compounds of formula (CF2=CF-CF2-CF(R-SO2Q)-CH2-CH=CH2) (II), in aqueous emulsion or suspension, in solution or organic suspension, using a polymerization initiator e.g. perfluoro(propionyl peroxide) and surfactant e.g. sodium dodecylsulfate. Preferred Definitions:    Q = F;    R = (CF2)x, (CF2)yOCF2CF2 or (CF2CF(CF3)O)zCF2CF2;    R2 = methyl, ethyl, propyl, butyl, phenyl, perfluoromethyl, perfluoroethyl or perfluorophenyl ;    x = 1-16 (preferably 1-4);    y = 1-12 (preferably 1-4); and    z = 1-16 (preferably 1-2).    EXAMPLE - A three necked clean flask was charged with deionized water (15 ml) and ammonium perfluorooctanoate solution (20% in 1ml). The solution was bubbled with nitrogen for 30 minutes. 2-(2-Allyl-1,1,2,3,3,4,5,5-octafluoro-pent-4-enyloxy)-1,1,2,2-tetrafluoro-ethanesulfonyl fluoride (2 g) was added to the flask under nitrogen and mixed to make an emulsion solution. After heating to 80 degrees C, 0.5 ml of solution was added and the flask was kept at 80 degrees C for 2 hours. 0.5 ml of initiator solution was added and stirred for another 2 hours. The flask was cooled with dry ice until frozen, then was warmed. After nitric acid (20% in 5 ml) was added and stirred at 90 degrees C for 30 minutes, cooled, filtered, washed with water for 3 times to give a white powder. The powder was dried in a vacuum oven at 100 degrees C for 4 hrs to obtain the polymer (1.8 g).