Polyoxymethylene (POM)/multi-walled carbon nanotubes (MWCNT) composites were pr ep ared by melt mixing MWCNTs and POM in a rotational rheometer.The morphology

con ductive property

dynamic rheological property

thermal property and crystallizati on behavior of the composites were investigated.It was found that MWCNTs

without any modification

dispersed homogeneously in the POM matrix.The conductive perco lation effect was observed when the MWCNTs content was 1 wt%

with the percolatio n threshold between 0.5 wt%～1.0 wt%.The thermal conductivity of POM/MWCNT com posites increased to 0.5289 W/(K m) with the addition of 1.0 wt% MWCNTs

1.5 times higher than that of pure POM [0.198 W/(K m)].When the content of MWCNTs is further increased

the thermal conductivity of the composites hardly cha nged.The effective media approach (EMA) was used to confirm that the moderate i ncrease of thermal conductivity was contributed to the interfacial resistance be tween MWCNTs and POM.MWCNTs have significant nucleating effect on POM

and 0.5 wt% MWCNTs could enhance the crystallization temperature of POM by about 6℃

b ut did not improve further with additional addition of MWCNTs.The complex viscos ity

storage modulus and loss modulus of the composites increase with the conten t of MWCNTs.