碳纳米管/尼龙66复合物的纳米压痕和结晶性能研究

Nanoindentation and crystallization of carbon nanotubes/PA66 composites

采用熔融共混法,在尼龙66(PA66)中分别加入不同质量百分含量的碳纳米管(CNTs)制成了CNTs/PA66复合材料。采用场发射扫描电镜、X射线衍射仪、差示扫描量热仪和纳米压痕分析了复合材料的形貌、结晶性能和机械性能。结果表明,CNTs均匀分布在PA66基体中,而且界面结合力很强;随着CNTs含量的增加,复合材料的熔融峰温度略为降低,结晶峰温度增加,硬度和弹性模量增加;与纯PA66相比,CNTs添加量为5%(质量分数)时,硬度和弹性模量分别增加了11.3%和19.2%。

A series of the composites of carbon nanotubes（CNTs） and PA66 were fabricated by melt-compounding.The dispersions of CNTs in the PA66,the crystal properties and mechanical properties of the composites were observed using field emission environmental scanning electron microscope,X-ray diffraction,differential scanning calorimetry and nanoindentation,respectively.The results show that the CNTs were dispersed homogenously in PA66 matrix,the melting temperature of composites decreased slightly,their crystallizing temperature,the hardness and modulus increased with increasing CNTs content,and the addition of 5wt% CNTs into the PA66 matrix improved the hardness and elastic modulus by about 11.3% and 19.2%,respectively.