TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fluorinated fluid is hydrofluoroether.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The sulfonyl fluoride polymer is contacted with the fluorinated fluid at -40 degrees C to 80 degrees C. Preferred Compound: The sulfonyl fluoride polymer is in pellet or granular form. The polymer contains polymeric fractions (less than 10 wt.%) having an average content of monomeric units comprising at least one sulfonyl fluoride group greater than 25 mole.%. The polymer have heat of fusion not greater than 3 (preferably not greater than 2) J/g. The polymer comprises recurring units derived from CF2=CFOCF2CF2-SO2F and tetrafluoroethylene. EXAMPLE - In 22 liter reactor, were introduced the following: an aqueous solution (3100 g) containing surfactant CF2ClO(CF2CF(CF3)O)p(CF2O)qCF2COOK (where p/q is 10, average molecular weight 527 g/mol) (5 wt.%) and water (95 wt.%); deionized water (9 l); monomer CF2=CFOCF2CF2-SO2F (I) (756 ml). The reactor was stirred at 470 rotation per minutes (rpm), was heated to 50 degrees C. The pressure inside the reactor was brought to 1 absolute MPa with mixture of carbon dioxide and trifluoroethanol (TFE). The partial pressure of TFE inside the reactor was 0.5 MPa. An aqueous solution (300 mL) having concentration of potassium persulfate (6 g/l) was fed into the reactor causing an increase in the pressure. The pressure was maintained constant by introducing TFE. The total mass of TFE fed into the reactor was 4000 g. The reaction was stopped after 234 minutes. At the end of this operation, stirring was slowed down and the reactor brought to ambient pressure and temperature, recovering polymerization latex with solid content (33 wt.%). The polymer latex was coagulated by freezing and thawing and the recovered polymer (P1) was washed with water and dried for 40 hours at 80 degrees C. The obtained polymer had heat of fusion of 1.05 J/g and an average content of monomer (I) (22.1 mole.%). A film was obtained from P1 was hydrolyzed and tested for the determination of the weight loss in water at 100 degrees C. The loss of weight after 24 hours and 96 hours was found to be 8.2% and 24.1%, respectively. The polymer (P1) (3 kg) was dried and pelletized. The pellets were introduced in 50 liter reactor and methoxy-nonafluorobutane (30 kg) was added. The reactor was stirred at 10 rpm and maintained at room temperature. After 24 hours, the stirring was stopped and the polymer was separated from the fluid by extracting the fluid phase from the lower part of the reactor. The obtained polymer had a heat of fusion of 1.21 J/g and an average content of monomer (I) (21 mole.%). A film was obtained from the treated polymer P1 was hydrolyzed and tested for the determination of the weight loss in water at 100 degrees C. The loss of weight after 24 hours and 96 hours was found to be 0.5% and 0.8%, respectively.