TECHNOLOGY FOCUS - POLYMERS - Preferred Ionomers: The ionomers are obtained by polymerization of a monomer of formula CF2=ZZ,Z, Z' = H, Cl, F, CF3(fluorine is preferred) with a monomer of formula CF2=CF-(O-CF2-CFY)p'-O-CF2CFRfa- SO2F,Y = F, CF3;Rfa = F, Cl, 1-4C perfluoroalkyl;p' = 0, 1, 2(p' is preferred to be 0). The perfluorinated sulfonic copolymers have the structuren' = 1-15;q' = 1-10;n'/q' = 1-10and the ionomer equivalent weight (EW) is 400-1300 (more preferably 650-800, most preferably 730-795). The -SO2F are converted to the SO3M ionic form as above.Preferred Ternary Mixture: The mixture consists of 5-20 wt.% water, 65-85 wt.% alcohol and 5-25 wt.% of a fluoro(poly)oxyalkylene having hydrogenated terminals and a b.pt. 80-120degreesC. Preferred alcohols are methanol (more preferred), ethanol, n-propanol (more preferred), isopropanol, butanol, isobutanol.Preferred Fluoropolyoxyalkylenes: The fluoropolyalkylenes consist of one or more of the following statistically distributed repeated units: -CFZO-, -CF2CFZO-, -CF2CF(CF3)O-, -CF(CF3)O-, -CZ2CF2CF2O-, -CF2CF(ORfb)O-, -CF(ORfb)O-,Z = H, F;Rfb = -CF3, -C2F5, -C3F7and hydrogenated end groups: -CF2H, - CF2CF2H, -CFH-CF3, CFH-ORfb or perfluorinated end groups: -CF3, -C2F5, C3F7. They have an average mol.wt. such that the b.pt. at 1 atm. is 25-200degreesC (more preferably 50-120degreesC). More preferred are compounds of the following formulae: (a) T1-O(CF2-CF(CF3)O)a(CFXO)B-T2 (b) T3-O(CF2CF2O)c(CF2O)d-T4 (c) T5 -O(CF2-CF(CF3)O)e(CF2CF2O)g-T6 (d) T7-O(CF2-CF(CF3)O)h-T8 (e) T9-O(CZ2-CF2CF2O)i-T10 (f) T11-O(CF2O))j(CF2CF(ORfb)O)k(CF(ORfb)O)l (g) T13-O(CF2-CF(CF3)O)m(CFXO)n(CFHO)o(CF2CFHO)p-T14 (h) T15-O(CF2CF2O)q(CF2O)r(CFHO)s(CP2CFHO)t-T16 (I) T17-O(CF2-CF(CF2)O)u(CF2CF2O)v(CFXC)w(CFHO)x(CF2CFHO)y- T18,T1, T2, T13, T14 = -CF2H, -CFH-CF3, -CF3, C2F5, -C3H7;X = F, -CF3;a/b = 5-15;T3, T4, T15, T16 = CF2H, CF2-CF2H, -CF3, C2F5;c/d = 0.3-5;T5, T6, T17, T18 = CF2H, -CF2CF2H, CFH-CF3, CF3, C2F5, C3F7;e/(f+g) = 1-10;f/g = 1-10;T7, T8 = CFH-CF3, C2F5, C3F7;T9, T10 = -CF2H, -CF2-CF2H, -CF3, C2F5, C3F7;Z = F, H;T11, T12 = -CF2H, - CF2CF2H, -CFH-ORfb, CF2, C2F5, C3F7;k+l, j+k+l = at least 2;k/(j+l) = 10- 2 - 10-3;l/j = 10-2 - 102;q/r = 0.5-2;(q+r)/(s+t) = 3-40;s+t = 3;(u+v)/w = 5- 40;(u+v)/(x+y) = 2-50;x+y = at least 3;s is lower than t and x lower than y,or of formula Rfo-Rf'-(ORF'')b'H or Rfo-O-Rh,Rfo, Rf', Rf'' = 1-12C perfluoroalkyl;b' = 0-4 (preferably 0-1);Rh 1-10C hydrogenated alkyl.The end groups can optionally contain one Cl instead of one F atom.Preferred Ionomer Content: The ionomer is present at 0.5-30 wt.%. EXAMPLE - A 1 wt.% solution of sulfonic isomer obtained by polymerizing TFE with CF2=CFOCF2CF2-SO2F, converted in SO3H form and with EW 770 was prepared by dissolution in a mixture of 7.3 wt.% water, 71 wt.% n-propanol and 21.7 wt.% of HCF2- O(CF2CF2O)m(CF2O)n-CF2N which had a boiling range 120-180degreesC and average mol.wt. 500 in a glass container. After 2 hours at 70degreesC the solution was ultracentrifugated at 22000 rpm for 1 hour and no precipitate was observed.