TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The chemical agent(s) comprises: (I) and optionally (II); difluoromethanedisulfonyl fluoride; difluoromethanedisulfonamide; 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptane-1,1-disulfonamide; and 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptane-1,1-disulfonyl fluoride.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The step (a) comprises: copolymerizing tetrafluoroethylene and per-F vinyl ether monomer(s) to produce linear perfluorinated polymer resin; and polymerizing per-F vinyl ether monomer(s) to produce the perfluorinated homopolymer resin. In the method, a molar ratio of tetrafluoroethylene to per-F vinyl ether monomer(s) on average in the perfluorinated polymer resin is less than or equal to 3:1. The polymerizing step is conducted using an initiator of bis(pentafluoropropionyl) peroxide or bis(heptafluorobutyryl) peroxide, and with or without using a fluorinated solvent including 2,3-dihydrodecafluoropentane and perfluorohexane. The step (b) comprises: bubbling ammonia gas through a liquid solution in which the perfluorinated polymer resin is dissolved; exposing the perfluorinated polymer resin in a solid state to ammonia gas; and adding additional amount of ammonia gas to a reaction vessel having the perfluorinated polymer resin in it in response to ammonia gas being consumed in the conversion of the sulfonyl fluoride groups to sulfonamide groups. The method further comprises: prior to the step (b), forming the perfluorinated polymer resin into microsized particles and then exposing the microsized particles to ammonia gas; controlling a pressure of ammonia gas in the reaction vessel to maintain a predetermined pressure through the conversion of the sulfonyl fluoride groups to sulfonamide groups; and after the step (c), treating the product polymer with more of the same and/or a different chemical agent to convert unreacted sulfonamide groups to sulfonimide groups. The step (c) comprises: co-adding a methanedisulfonyl fluoride compound of formula (F-SO2Rf-SO2-F) (I), a methanedisulfonamide compound of formula (NH2-SO2-Rf1-SO2-NH2) (II) and the perfluorinated polymer in sulfonamide form into a reaction vessel with at least on polar solvent and an amine catalyst; combining (I) and (II) in the reaction vessel with an amine catalyst and solvent(s) to cause a reaction that produces a linear oligomer material with the sulfonyl fluoride end groups, and then combining the perfluorinated polymer in sulfonamide form and the linear oligomer material to convert the sulfonamide groups in the perfluorinated polymer to sulfonimide groups, and at the same time, generate 3-dimensional cross-linked, low equivalent weight, perfluorinated polymer electrolyte materials; and combining X moles of (I), Y1 moles of (II) and Z moles of the perfluorinated polymer (calculated by sulfonamide groups) according to an equation of (X/(Y1+0.5Z)), where X and Z are greater than 0, and Y1 is greater than or equal to 0. The unreacted sulfonamide groups are converted to additional sulfonimide groups. The conversion of the unreacted sulfonamide groups includes terminating the side chains with 1,1,1-trifluoroethane groups and sulfonyl fluoride groups, which are then converted to sulfonic acid groups.Rf, Rf1 = -(CF2)n- or -(CF2)n1-O-(CF2)n1-;n = 1-6; andn1 = 1-4.Preferred Components: The perfluorinated polymer electrolyte material has equivalent weight of less than or equal to 850 g/mole, preferably less than or equal to 625 g/mole.