TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): Preparation of the polyarylene block copolymer comprises: copolymerizing (II), sulfonate compounds of formula ((X)2Ar11-(Y1((((R11SO3R12)x1)Ar12-Z)b5)-Ar13)a5-(R11-SO3R13)x2) (III) and optionally substituted aryl compound of formula ((X)2Ar10(R1s)e7-(V1-R1h)f7) (IV).Ar11, Ar12, Ar13 = benzene ring, condensed aromatic ring e.g. naphthalene or nitrogen-containing heterocyclic ring (all optionally substituted with F);Y1 = CO, SO2, SO, CONH, COO, (CF2)u1, C(CF3)2 or direct bond;Z = O, S, direct bond, CO, SO2, SO, (CH2)l1 or C(CH3)2;R11 = direct bond, O(CH2)p1, O(CF2)p1, (CH2)p1 or (CF2)p1;R12, R13 = H, alkali metal atom, aliphatic hydrocarbon, alicyclic or heterocyclic ring containing O;X = Cl, Br, I, methanesulfonyl, trifluoromethanesulfonyl, benzenesulfonyl or toluenesulfonyl;Ar10 = divalent group having at least one structure comprising benzene ring, condensed aromatic ring or nitrogen-containing heterocyclic ring including pyrrole, thiazole, isothiazole, oxazole, isoxazole, pyridine, imidazole, imidazoline, pyrazole, 1,3,5-triazine, pyrimidine, pyridazine, pyrazine, indole, quinoline, isoquinoline, purine, benzimidazole, benzoxazole, benzothiazole, tetrazole, tetrazine, triazole, carbazole, acridine, quinoxaline or quinazoline (all optionally substituted by alkyl e.g. methyl, ethyl and propyl, aryl e.g. phenyl, tolyl and naphthyl, CN or F);V1 = divalent organic group, preferably O, S, direct bond, CO, SO2 or SO;e7 = 0-4;f7 = 1-5;R1s = direct bond or divalent organic group comprising 1-20C hydrocarbon (e.g. methylene and ethylene), aromatic ring (e.g. phenylene), condensed aromatic ring or nitrogen-containing heterocyclic ring;R1h = nitrogen containing ring;u1, l1 = 1-10;p1 = 1-12;x1 = 0-4;x2 = 1-5;a5 = 0-1; andb5 = 0-3.Provided that at least one of all R12 and R13 is H. Preferred Components: The number average molecular weight in terms of polystyrene of a precursor for introducing polymer segment (B) is 1000-50000. The polyarylene block copolymer comprises (a) and (b) in a molar ratio of 100:0 to 50:50. The polymer segment (A) is substituted aryl compounds of formula (=Ar11-(Y1((((R11SO3R12)x1)Ar12-Z)b5)-Ar13)a5-(R11-SO3R13)x2) (d1). EXAMPLE - 3-(2,5-Dichlorobenzoyl)benzene sulfonic acid neopentyl (38.81 g), 2,5-dichloro-4'-(pyridine-2-oxy)benzophenone (0.334 g), 6,6'-(4,4'-(3,3,5-trimethylcyclohexane-1,1-diyl)bis(4,1-phenylene))bis(oxy)bis(2-chlorobenzonitrile) (14.92 g), bis(triphenylphosphine)nickeldichloride (1.96 g), triphenylphosphine (2.36 g) and zinc (11.77 g) were mixed and dried dimethylacetamide (DMAc) (160 ml) was added into the mixture, under nitrogen. The reaction system was heated under stirring (heated eventually to 79 degrees C) and the reaction was made for 3 hours. During the reaction, the increase in viscosity in the system was observed. The polymerization reaction solution was diluted with DMAc (193 ml) and the resultant was stirred for 30 minutes, and filtered. Into the filtrate, lithium bromide (29.4 g) was added, and the mixture was reacted, with the temperature of the mixture being 120 degrees C for 7 hours, under nitrogen atmosphere. After the reaction, the reaction liquid was cooled, which was poured to 4.1l water for precipitation. The product precipitated was soaked in acetone and the resultant was filtered. Then, the filtrate was washed. The washed product, while being stirred in 1N sulfuric acid (6500 g), was washed. The product was filtered, and the filtrate was washed with ion exchange water to obtain (3-(benzoyl)benzene sulfonic acid)-(4'-(pyridine-2-oxy)benzophenone)-(benzonitrile-poly(6,6'-(4,4'-(3,3,5-trimethylcyclohexane-1,1-diyl)bis(4,1-phenylene))bis(oxy)benzonitrile)).