Abstract: Acid-treated MWCNTs were grafted onto the surface of glass fiber (GF) by the coupling effect of 3-aminopropyltriethyloxy silane (KH550), resulting in GF-MWCNTs. The GF-MWCNTs was used to reinforce POM, and the mechanical properties, thermal and electrical performance of the POM composites were investigated. It showed that when the filler content was low, the tensile strength and notched impact strength were increased and achieved the maximum at the filler content of 3 wt% and 1 wt%, respectively, and then decreased continuously with increasing filler content. When the content of GF-MWCNTs was 10 wt%，the tensile strength and notched impact strength of the POM/GF-MWCNTs composites were lower than those of neat POM. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) indicated that the addition of GF-MWCNTs could not only increase thermal stability of composite systems, but also affect the crystallization behavior of POM, increase the crystallization temperature and crystallinity. In addition, the testing results of electrical performance showed that the incorporation of GF-MWCNTs helped to decrease the volume resistivity of the composites.

Key words: polyoxy-methylene, glass fiber, multi-walled carbon nanotube, thermal stabilization