Abstract: The dynamic mechanical behavior of poly(ether ether ketone)(PEEK) mixedwith carbon fibre(CF)has been investigated from room temperature to 250℃,Two internalfriction peaks(α peak and α' peak) have been found in this temperature range.The experi-ments show that α peak relates to a relaxation course in which glasslike state transforms torubberlike state and peak α' relates to a pre-melting course,PEEK specimens containing dif-ferent CF content show different behavior for both α and α'peaks.DSC tests give out thesame results as the dvnamic mechanical measurements.

Key words: PEEK, CF, internal friction, T_g