TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The block (B1) has structural unit expressed with formula (I,III,IV). The block (B2) has structural unit expressed with formula (II). The block (B2) contains repeating unit of formula (IIa). The connection structure of aromatic ring in the principal chain of block (B1) is shown with 3 connection patterns of formulae (3a-3c).m=5 or more, preferably 20 or more;n,Ar1-Ar5,a,b,c,R2,p1,p2=as defined above;R1=same as R1;p=0-3;m2=3 or more;andXa,Xb=direct bond or bivalent group chosen from carbonyl, sulfonyl, 2,2-isopropylidene, 2,2-hexafluoro isopropylidene or 9,9-fluorene diyl group.The polyarylene group block copolymer is manufactured by carrying out polymerization in the copresence of a nickel complex and zinc. The nickel complex is complex containing nickel (0) bis(cyclooctadiene) and 2,2'-bipyridyl, or complex containing hydrogenated nickel and 2,2'-bipyridyl. Preferred Group: The ion exchange group is acidic radical chosen from sulfonic acid, phosphonic acid, carboxylic acid, sulfonimide group. Preferred Properties: The percentage of connection pattern (TP) calculated from following equation: TP=nc/(na+nb+nc), is 0.6 or less, where na-nc are number of objects of connection patterns of formulae (3a-3c), respectively. The ion exchange capacity of the polyarylene group block copolymer is 0.5-4 meq/g. EXAMPLE - Dimethyl sulfoxide (600 ml), toluene (200 ml), sodium salt of 2,5-dichlorobenzene sulfonic acid (in g) (26.5), PES5200P (RTM: polyether sulfone) (10) and 2,2'-bipyridyl (43.8), were taken in a flask and heated to 150degreesC. Azeotrope dehydration of the reaction mixture was carried out. The reaction mixture was cooled to 60degreesC and added with bis (1,5-cyclooctadiene) nickel (0) complex (73.4), and heated to 80degreesC with stirring for 5 hours. The obtained reaction solution was poured into 6 mol/l hydrochloric acid to precipitate the polymer. The precipitate was separated by filtration, washed with water and dried under reduced pressure to form polyarylene group block copolymer (16.3) having number average molecular weight of 1.5x105, weight average molecular weight of 2.7x105, water absorption of 120%, ion exchange capacity of 2.3 meq/g, proton conductivity 4.3x10-2 S/cm at 50% RH, and dimensional change rate of 2.7%.