Abstract: The properties of PEEK fiber and its fabric were widely studied. The results showed that the breaking strength of drawn PEEK fiber was up to 6.6 cN/dtex, the breaking elongation percentage was 12.6 %. The moisture content of PEEK fiber was 2.19 %, and the average abrasion resistance of PEEK fabric was 6785 times. After a heat aging at 270 ℃ for 50 days, PEEK fibers yellowed and became brittle, the dimensional change of PEEK fabric was -9.9 %, but the breaking strength retained about 80%. Through IR, XRD and DSC analysis, it was found that the change of mechanical performance and color of PEEK fiber after heat aging were due to the relaxation of segments and the breaks or branched of few chains. And the increasing and perfecting of crystalline were the main reasons for the high conservation rate on the strength of PEEK fiber.

Key words: poly (ether-ether-ketone) fiber , poly (ether-ether-ketone) fibric , property , heat aging