Fa. Bottino et al., Synthesis and characterization of novel poly(arylene ether)s containing 1,3,4-oxadiazole units, MACRO RAPID, 20(8), 1999, pp. 405-409
Starting from some new 2,5-disubstituted-1,3,4-oxadiazole difluorides, synt
hesized by cyclocondensation of dihydrazides with 4-fluorobenzoic acid, nov
el poly(arylene ether)s were prepared by halo displacement polymerizations
with bisphenol A in the presence of potassium carbonate. Model reactions de
monstrated the unsuitableness for halo displacement reactions of the difluo
ride containing the SO2 group. The synthesis and characterization of polyme
rs are discussed and the thermal properties are compared with those of othe
r polymers reported in literature.