Oligo(Ether-Sulfones). 1. Functionalized Oligo(Ether-Sulfones) from 4,4-Bis(4-Hydroxyphenyl)-Pentanoic Acid AndBis(4-Chlorophenyl)Sulfone: Synthesis, Properties, and Substitution of the Chlorophenyl-Endgroups

Several oligo(ether-sulfones) with carboxylic groups in the side chains and chlorophenyl-endgroups were synthesized by polycondensation of different relative amounts of bis(4-chlorophenyl)sulfone (1) and 4,4-bis(4-hydroxyphenyl)pentanoic acid (2). The molecular weight distributions of the oligo(ether-sulfone)-fractions were estimated by GPC and MALDI-TOF (3a-c). The glass transition temperatures of the oligo(ether-sulfones) increase with the molecular weight of the oligomers. Additionally, the chlorophenylendgroups of 3b were substituted with different 4-alkoxyphenols via nucleophile aromatic displacement. The resulting oligo(ether-sulfones) 4b, 5b and 6b with alkyloxy-endgroups show slightly lower Tg-values compared with the corresponding oligomer with chlorophenyl-endgroups.