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Abstract

A poly(arylether sulfone) polymeric material comprising polymer molecules wherein more than 50% moles of the recurring units of said polymer molecules are recurring units (Rt), equal to or different from each other, complying with formula (S_t): -E-Ar¹—S0₂-[Ar²-(T-Ar³)_n—S0₂]_m-Ar⁴— (formula S_t) wherein: n and m, equal to or different from each other, are independently zero or an integer of 1 to 5, each of Ar¹, Ar², Ar³ and Ar⁴ equal to or different from each other and at each occurrence, is an aromatic moiety, T is a bond or a divalent group optionally comprising one or more than one heteroatom—E is of formula (E_t): wherein each of R′, equal to or different from each other, is selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, aryl, ether, thioether, carboxylic acid, ester, amide, imide, alkali or alkaline earth metal sulfonate, alkyl sulfonate, alkali or alkaline earth metal phosphonate, alkyl phosphonate, amine and quaternary ammonium; j′ is zero or is an integer from 1 to 4; and wherein the fraction of polymer molecules having a molecular weight of below 5 000 [% fraction M^<5000, hereinafter] with respect to all the polymer molecules in said polymeric material is of at most 10% weight, and wherein said % fraction M^<5000 is of at least [3.02-PDI] % when the polymeric material possesses a polydispersity index (PDI) of below 3.02.

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First Claim