NOVELTY - Polyarylene ether sulfone group block copolymer contains sulfone repeating units (I) and (II).    USE - For forming polymer film used for polymeric electrolyte film (both claimed). Also for forming structural material e.g. piping coupling for housing, raising box for animal experiments, medical sterilization box, heat insulation wall, water tap and pan. The polymer film is used for food engineering, pharmaceutical and medical separation membrane e.g. precise filtration film, ultrafiltration membrane, reverse osmosis membrane, diffusion dialysis membrane, electrical machinery dialysis membrane, gas separation membrane, antistatic film, anti-reflective coating and printed circuit board. The polymeric electrolyte film is used for manufacturing polymer electrolyte fuel cell, lithium ion battery, pigment sensitization-type solar cell, organic solar cell and for hydrolysis of water.    ADVANTAGE - Polyarylene ether sulfone group block copolymer has good thermal property, mechanical capability and electrical property.    DETAILED DESCRIPTION - Polyarylene ether sulfone group block copolymer has sulfone repeating units of formulae (I) and (II).    Y = O, S, SO2, C(O) or CR2R3;    Z = O, S, SO2, C(O) or CR5R6;    R1 = 1-10C alkylene;    R2-R6 = H or 1-6C alkyl ;    m, n, p, q = 0 or 1;    a+b = more than 0;    c+d, g+h = 0 or more;    k, l = 2-200.    INDEPENDENT CLAIMS are also included for:    (1) manufacture of polyarylene ether sulfone group block copolymer which involves:    (i) reacting diol of formula (V) with an alkali metal compound,    (ii) reacting with dihalogenating compound of formula (VII) to form block unit precursor (A),    (iii) reacting diol compound of formula (VIII) with alkali metal compound and subsequently, reacting with dihalogenating compound (VII) to form to form block unit precursor (B);    (iv) mixing block unit precursors (A) and (B) to form polyarylene ether sulfone group block copolymer with alkoxy group;    (v) reacting the block copolymer with Lewis acid to form block copolymer with hydroxyl group; and    (vi) reacting block copolymer with alkali metal compound and sulfonating agent; and    (2) polymer film which consists of polyarylene ether sulfone group block copolymer; and (iii) polymeric electrolyte film which has polymer film.    W = O, S, SO2, C(O) or CR8R9;    r, s, t, u = 0 or 1;    e+f = more than 0;    X = F, Cl or Br;    A = O, S, SO2, C(O) or CR11R12;    R8-R12 = H or 1-6C alkyl group;and    i+j = 0 or more.