中文摘要：

将化学共沉淀法合成的Co掺杂的Fe3O4（Co-Fe3O4）磁性粒子和化学氧化法合成的聚苯乙烯磺酸钠（PSS）掺杂的聚（3,4-乙撑二氧噻吩）（PEDOT-PSS）与聚乙烯醇（PVA）混合制备复合纺丝原液,然后经过湿法纺丝得到具有电、磁性能的PEDOT-PSS/Co-Fe3O4/PVA复合纤维.通过SEM、FTIR、XRD、TG、VSM以及电导率和机械性能的测试研究了不同牵伸倍率对复合纤维的结构和性能的影响.结果表明,随着牵伸倍率的增加,复合纤维的结晶性能、热稳定性能和机械性能都有所提升,其电导率则成倍增加,而其饱和磁化强度（Ms）则变化不大,约为1.7 A·m^/kg.当牵伸倍数为4倍时,复合纤维的电导率可达到2.3 S/cm.

英文摘要：

The composite fibers with electromagnetic function were prepared by using the aqueous mixture of poly（ vinyl alcohol）（ PVA）,poly（ 3,4-ethylenedioxythiophene）-poly（ sodium-p-styrenesulfonate）（ PEDOTPSS） and Co doped Fe3O4 magnetic particles（ Co-Fe3O4） as the spinning solution via a conventional wet spinning process. Effects of draw ratios on the structure and properties of PEDOT-PSS / Co-Fe_3O_4/ PVA composite fibers were studied. The morphology,structure,crystallinity,thermal stability,mechanical properties,conductivity and magnetic properties of the composite fibers were studied by scanning electron microscope（ SEM）,Fourier transform infrared spectrometer（ FTIR）,powder X-ray diffraction（ XRD）,thermogravimetric analyzer（ TG）,electronic single fiber tensile strength tester（ ESFTST）,four-probe conductivity meter（ FPCM） and vibrating sample magnetometer（ VSM）. The SEM images show that the diameters of the composite fibers are in the range of 20- 30 μm with a rough surface and reniform cross section. And with the increase of the draw ratio,the fiber diameters decrease. FTIR spectra indicate that with the increase of the draw ratio,most absorption peaks increased indicating the increase of the orientation of polymer molecular chains along with the draw direction. The results of XRD,TG,ESFTST and FPCM present that the composite fiber＇s crystal properties,thermal stability and mechanical properties are all improved with the increase of the draw ratio,and the conductivity increased multiply. However,the saturation magnetization of the composite fibers is almost independent of draw ratios,which is about 1. 7 A·m^2/ kg. When the draw ratio of the composite fiber is4,the conductivity can reach to 2. 3 S / cm,ten times the conductivity when the draw ratio is 2.