POM/GF-MWCNTs复合材料的制备及其性能研究

将经γ氨丙基三乙氧基硅烷（KH550）处理后的多壁碳纳米管（MWCNTs）接枝到玻璃纤维（GF）表面，制成GF-MWCNTs复合填料，通过双螺杆挤出机熔融共混制备出聚甲醛（POM）/GF-MWCNTs复合材料，并对其力学性能、热性能及电性能进行了测试。结果表明，GF-MWCNTs添加量较低时，复合材料的拉伸强度和缺口冲击强度都有所提高，且分别在3 %（质量分数，下同）和1 %时达到最大值，之后则随着填料含量的增加而不断降低；当GF-MWCNTs的添加量达到10 %时，复合材料的拉伸强度和缺口冲击强度已然低于纯POM；加入GF-MWCNTs提高了复合材料的热稳定性，使POM的结晶温度和结晶度提高；GF-MWCNTs能降低复合材料的体积电阻率，但由于未在POM基体中形成逾渗网络，复合材料导电性提高并不明显。

Preparation and Performance of POM/GF-MWCNTs Composites

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.