TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): Aromatic monomers of formulae (A)-(E) are condensation-polymerized in presence of zero-valent transition metal complex.Q=group which desorbs during condensation reaction;A31-A32=ion exchange group, or substituent containing ion exchange group;R31-R32=1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy or 2-20C acyl (all optionally substituted fluoro or substituent excluding ion exchange group);andp31,p32=0-3.Preferred Composition: The polymer further includes structural units of formulae (IIc), (IIId), (A'), (B') and/or (C'). The minimum activation energy at the time of hydroxyl group addition to carbon atom of 1-position or carbon atom of 2-position in compound (C') is C. The minimum activation energy at the time of hydroxyl group addition to carbon atom of 1-position or carbon atom of 2-position in compound (A') is A. The minimum activation energy at the time of hydroxyl group addition to carbon atom of 1-position or carbon atom of 2-position in compound (B') is B. The minimum activation energy (C) is larger than minimum activation energy (A) and minimum activation energy (B). The minimum activation energy at the time of hydroxyl group addition to carbon atom of 1-position or carbon atom of 2-position in compound (C') is D. The minimum activation energy at the time of hydroxyl group addition to carbon atom of 1-position or carbon atom of 2-position in compound (A') is A. The minimum activation energy at the time of hydroxyl group addition to carbon atom of 1-position or carbon atom of 2-position in compound (B') is B. The minimum activation energy (D) is larger than minimum activation energy (A) and minimum activation energy (B).A-C'=ion exchange group, or substituent containing ion exchange group;R13-R18=1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy or 2-20C acyl (all optionally substituted fluoro or substituent excluding ion exchange group);andp13-p18=0-3. EXAMPLE - Zinc powder (in g) (5.3) and N,N-dimethylacetamide (200) were heated at 80 degrees C, methane sulfonic acid (0.15) was added to the reaction mixture, maintained for 2 hours, nickel bromide (3), 2,2'-bipyridine (3.2) and 2,2'-disulfonic acid-di(2,2-dimethyl propyl)-4,4'-dichlorobiphenyl (38.8) were added to the reaction mixture, stirred at 60 degrees C for 4 hours and polymerized, to obtain polymer having weight average molecular weight of 296000 and number average molecular weight of 104000.