聚醚醚酮纤维的拉伸定形后处理研究

Study on Post-treatment of Poly-ether-ether-ketone Fibers

通过熔融纺丝制得聚醚醚酮(PEEK)纤维,并采用差示扫描量热仪(DSC)、声速取向测量仪、热重分析仪、单纱电子强力仪分别研究了干热拉伸及热定形处理对PEEK纤维结晶和取向、热稳定性及力学性能的影响。结果表明:随着热拉伸倍数增大,PEEK纤维取向度、结晶度增加,纤维的断裂强度增加,断裂伸长减小;PEEK纤维的热拉伸温度应选在200～240℃,热定形温度应为220～260℃;PEEK纤维的重结晶主要是在热拉伸过程中完成,热定形则进一步完善纤维的结晶结构;经过后处理,PEEK纤维的断裂强度可达到6.12cN/dtex;且具有优异的热稳定性能,热分解温度高达505℃,后处理几乎不影响PEEK纤维的热稳定性。

Poly-ether-ether-ketone （PEEK） filament had been prepared by appropriate melt spinning. The effects of dry hot-drawing and thermosetting on crystallization, orientation behaviors, the thermal stability and the mechanical properties of PEEK fiber had been respectively investigated by differential scanning calorimetry, sonic velocity testing meter, thermogravimetry analyzer and electronic tester of tension strength. The results showed that the orientation degree, crystallinity and tension strength increased, but the elongation reduced as drawing ratio increased. The drawing temperature range nas 200-240 ℃ and thermosetting temperature range is between 220 ℃ and 260 ℃. The recrystallization of PEEK fiber was mainly finished at drawing process and completed in subsequently thermosetting. The tensile strength of PEEK fiber could reach 6.11 cN/dtex by post-treatment. The fiber had excellent thermal stability, its decomposition temperature was 505 ℃. The effect of post-treatment on the thermal stability of PEEK fiber eould be neglected.