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)(PEDOT-PSS) 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-Fe3O4/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 m 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 m2/kg.When the draw ratio of the composite fiber is 4

the conductivity can reach to 2.3 S/cm

ten times the conductivity when the draw ratio is 2.