TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): The new polyarylene is obtained by polymerizing a monomer composition containing compounds (II,IIA,III) in the presence of a nickel compound. Preferred Component: The polyarylene consists of repeating unit of formula: -(-(-(-Ar1-Y'1-)a-Ar2-Z1-(-(-Ar3-Y'2-)b-Ar4-Z2-)c-)n-(-Ar1-Y'1-)a-Ar2-)-, repeating unit of formula: -Ar0-, and repeating unit of formula (VI).a,b,c=0 or 1;n=5 or more;Ar1-Ar4=bivalent aryl optionally substituted by 1-20C alkyl (optionally substituted by fluoro, cyano, 1-20C alkoxy, 6-20C aryl, and/or 6-20C aryloxy), 1-20C alkoxy (optionally substituted by fluoro, cyano, 1-20C alkoxy, 6-20C aryl, and/or 6-20C aryloxy), 6-20C aryl (optionally substituted by fluoro, cyano, 1-20C alkoxy, and/or 6-10C aryloxy), 6-20C aryloxy (optionally substituted by fluoro, cyano, 1-20C alkoxy, and/or 6-20C aryloxy), or 2-20C acyl (optionally substituted by fluoro, cyano, 1-20C alkoxy, 6-20C aryl, and/or 6-20C aryloxy);Y'1,Y'2=single bond, carbonyl, sulfonyl, isopropylidenyl, hexafluoroisopropylidenyl, or fluorine-9,9-diyl;Z1,Z2=oxygen or sulfur;Ar0=bivalent aryl optionally substituted by 1-20C alkyl (optionally substituted by fluoro, cyano, 1-20C alkoxy, 6-20C aryl, and/or 6-20C aryloxy), 1-20C alkoxy (optionally substituted by fluoro, cyano, 1-20C alkoxy, 6-20C aryl, and/or 6-20C aryloxy), 6-20C aryl (optionally substituted by fluoro, cyano, 1-20C alkoxy, and/or 6-10C aryloxy), 6-20C aryloxy (optionally substituted by fluoro, cyano, 1-20C alkoxy, and/or 6-20C aryloxy), or 2-20C acyl (optionally substituted by fluoro, cyano, 1-20C alkoxy, 6-20C aryl, and/or 6-20C aryloxy), or optionally protected sulfo;m2=0-4;andh=1-10. EXAMPLE - 170 g 4-Chloro-2-iodo aniline and 102 g copper powder were dissolved in 680 g dimethyl sulfoxide, and heated to 120 degrees C. After heat-retaining the mixture for 2 hours, 102 g 5-iodo-octafluoro-3-oxapentane potassium sulfonate was added and heat-retained for 2 hours. The obtained mixture was liquid-separated after being poured into a liquid mixture of 2720 g water and 1360 g toluene, and insoluble matter was filtered. The water layer was washed twice with water and concentration-dried. The precipitate obtained by adding 924 g 50% sulfuric acid was filtered and washed with 415 g 10% sulfuric acid to obtain 59.1 g intermediate. 52.1 g Intermediate was dissolved in a mixed solution of 287 g water and 14 g concentrated sulfuric acid. At 0 degrees C, the obtained solution was dripped with 26.4 g 36% sodium nitrite aqueous solution and heat-retained for 1 hour. 20.8 g Monovalent copper bromide was dissolved in 251 g 48% hydrobromic acid, and the solution was heated to 50 degrees C and heat-retained for 2 hours. After cooling the obtained reaction mixture to room temperature, 555 g diethyl ether and 208 g water were added. The oil layer obtained by liquid-separation was washed twice with 555 g water and dried. The filtrate was concentrated and dried to obtain a solid. The solid was dissolved in 18 g water and pH-adjusted to 6 using 5% sodium hydroxide aqueous solution. The solution was concentrated and dried to obtain 29.2 g sodium 2-(2-(2-bromo-5-chlorophenyl)-1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoroethane-1-sulfonate with a yield of 34.1%. 1.34 g Bipyridine, 769 mg 4,4'-dichloro-2,2'-bis(trifluoromethyl)biphenyl, and 500 mg sodium 2-(2-(2-bromo-5-chlorophenyl)-1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoroethane-1-sulfonate were dissolved in 10 g dimethyl sulfoxide and heated to 50 degrees C. The obtained mixture was heated to 70 degrees C after addition of 2.17 g nickel(0) bis(cyclooctadiene) and stirred for 2 hours. The obtained reaction mixture was poured into 45 g water and filtered. The obtained precipitate was washed thrice with water and stirred for 1 hour in 20 g 20% nitric acid added with sodium nitrite. Precipitate was filtered, washed with 19% hydrochloric acid until filtrate pH was greater than 3.5, and dried to obtain 1.05 g polyarylene having repeating units of formulae (A) and (B). The polyarylene had a weight average molecular weight of 16.2x 103, a number average molecular weight of 11.7x 103, and an ion-exchange capacity of 0.64 meq/g.