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采用熔融共混法,在聚己二酸己二胺(PA66)中分别加入不同质量百分含量的羧基化碳纳米管(MWNTs-COOH),制成PA66/MWNTs复合纤维。采用差示扫描量热分析(DSC)和热重分析(TG)对复合纤维的结晶及热学性能进行了分析,用场发射扫描电镜(FESEM)对其表面形貌进行了表征。结果表明,加入了MWNTs-COOH以后,PA66/MWNTs复合纤维的熔点随着MWNTs-COOH含量的变化基本不变,但是结晶度逐渐降低,结晶温度逐渐升高;同时使得复合纤维的开始分解温度和最大分解温度略有升高。MWNTs-COOH在PA66/MWNTs复合纤维中分布均匀,且沿着纤维的轴向呈束状分布。
The PA66 / MWNTs composite fibers were prepared by melt blending with different mass percentages of carboxylated carbon nanotubes (MWNTs-COOH) in polyhexamethylene adipamide (PA66). The crystallization and thermal properties of the composite fibers were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The surface morphology of the composite fibers was characterized by field emission scanning electron microscopy (FESEM). The results showed that the melting point of PA66 / MWNTs composite fibers changed little with the content of MWNTs-COOH after the addition of MWNTs-COOH, but the crystallinity gradually decreased and the crystallization temperature gradually increased. At the same time, the initial decomposition temperature and The maximum decomposition temperature slightly increased. MWNTs-COOH in the PA66 / MWNTs composite fibers evenly distributed, and along the fiber axial distribution was bundles.