Synthesis and Cross-linking of Poly(ether-ketone)s, and Poly(ether-ketone-sulphone)s with Pendant

Anumber of new poly(ether-ketone)s and poly(ether-ketone-sulphone)s are synthe-sized by polycondensation of (a) benzofuro[2,3-b]benzofuran-2,9-dicarbonyl chlo-ride (I), (b) equimolar mixture of I and 4,4’-[sulphonyl bis(p-phenyleneoxy)] diben-zoyl chloride (II), and (c) 2,7-biphenylene dicarbonyl chloride (III) with 2,6-diphenoxy ben-zonitrile and a number of diaryl ethers through indirect polycondensation in the presence of aluminum chloride as catalyst. Molecular structures were confirmed by FTIR spec-troscopy and elemental analysis data. Because of the presence of nitrile groups along the polymer chain, the polymers were cross-linked. Thermal properties before and after cross-linking were investigated by TGA and DSC methods