Multi-walled carbon nanotubes(MWNTs)/polyacrylonirtile(PAN) composite fibers were prepared by dry-jet wet spinning, and the static and dynamic mechanical properties of the composite fibers were studied. The results reveal that using air-draw new process, the mechanical properties of PAN fibers were improved remarkably after the introduction of a small amount of MWNTs. MWNTs are liable to orientate under drawing. The strong interactions between MWNTs and PAN chains induce a part of PAN chains, which interact with MWNTs, to orientate and crystallize, thus the crystallinity, orientation and the mechanical properties of the composite fibers are improved.%采用干湿法纺丝工艺制备了多壁碳纳米管(MWNTs)增强的聚丙烯腈(PAN)复合纤维,表征了复合纤维的动静态力学性能.结果表明.采用空气拉伸新工艺并添加少量MWNTs后显著提高了PAN纤维的力学性能;由于MWNTs容易在拉伸作用下取向,且与PAN间存在较强的相互作用,使得与MWNTs作用的PAN分子更易取向并结晶,从而提高了复合纤维的结晶度和取向度,达到了增强的效果.
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