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Dielectric relaxation spectroscopy (DRS) and dynamic mechanical thermal analysis (DMTA) were used to investigate the secondary relaxation behaviour of poly(ether ether kctone) (PEEK), poly(etherimide) (PEI) and a miscible PEEKPEI blend. The data from each technique, for the y-process, did not lie on the same Arrhenius line, ivhile the rate of molecular motion of the y-process in the blends was largely an average of each component's motions. The B-process in PEI was plasticised by the presence of PEEK.

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