Poly(p -phenylene sulfide) (PPS) and multiwall carbon nanotubes (MWCNTs) were melt blended into composites which were melt spun into PPS/MWCNT composite fibers.The dispersion state of MWCNTs in polymer matrix

interfacial interaction between MWCNTs and polymer matrix

crystallization behavior and mechanical properties of composite fibers were carefully investigated by scanning electron microscopy (SEM)

Raman spectroscopy

differential scanning calorimetry (DSC)

dynamic mechanical analysis (DMA) and tensile properties testing.And the relationship between microscopic structures and macroscopic properties was explored.The experimental results show that good dispersions as well as well-bonded interfaces between polymer matrix and MWCNTs were obtained in the composite fiber due to the - stacking interactions between PPS and MWCNTs.The well-dispersed MMCNTs showed an efficient nucleation ability for PPS matrix.The stretching during melt spinning was benefit for disaggregation of MWCNTs in PPS matrix and orientation of MWCNTs along the stretching direction.As evidenced by Raman spectra

stretching during melt spinning promoted the interfacial - stacking interaction effectively and realized the interfacial enhancement in composites.

finally resulting in a great improvements of mechanical properties of fibers.When the content of MWCNTs increased to 5 wt%

the storage modulus was greatly improved and the tensile strength of fibers was increased by 220% compared with that of pure PPS fibers.