Abstract: | The monomer sequence distributions of three types of aryl ether sulphone copolymers have been determined by 13C n.m.r. spectroscopy. Two amorphous aryl ether sulphone copolymers were shown to have transetherified (or ether interchanged) during polymerisation to become random copolymers. The residues in these copolymers were (i)—OøOøSO2øS—and (ii)—OøSO2øøSO2ø—-where ø denotes 1,4-phenylene. Copolymers of 50:50 aryl ether sulphone and aryl ether ketone made from different combinations of monomers were found to have different solubilities in dimethyl sulphoxide, and from 13C n.m.r. data this was shown to correlate with the amount of transetherification which had taken place during the polymerisations. The 13C n.m.r. chemical shifts for some of the carbon nuclei in these polymers were sensititive to functional groups situated even as far away as three or four aromatic nuclei along the polymer chain. |