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采用十二烷基苯磺酸钠对碳纳米管进行物理改性,并将改性碳纳米管与聚乳酸熔融共混制备了碳纳米管/聚乳酸复合材料,根据红外光谱、拉曼光谱、扫描电镜和电性能等测试重点研究了改性碳纳米管的表面形貌和结构,以及复合材料的力学性能和电性能。其中,红外光谱和拉曼光谱证实了碳纳米管成功进行了物理改性,扫描电镜一方面显示出改性碳纳米管团聚现象大大改善;另一方面表明改性碳纳米管在聚乳酸中能够很好地分散,复合材料的力学性能和电性能因而得到显著提高。添加1.0%改性碳纳米管后,复合材料的拉伸强度由48.2 MPa升高至56.7 MPa,电导率升高至1.5×10~(-8)Ω·cm,导电逾渗值由未改性时的1.74%降低到改性后的0.56%。另外,热处理过程也对复合材料的导电性产生影响,这与热处理后受聚乳酸非结晶区挤压导电网络的重构能力有关。
Carbon nanotubes were modified by sodium dodecylbenzenesulfonate and carbon nanotubes / polylactic acid composites were prepared by melt blending modified carbon nanotubes with polylactic acid. According to the infrared spectra, Raman spectra, Scanning electron microscopy and electrical properties of the test focused on the surface morphology and structure of the modified carbon nanotubes, as well as the mechanical properties and electrical properties of composite materials. Among them, infrared spectroscopy and Raman spectroscopy confirmed the successful physical modification of the carbon nanotubes, and the scanning electron microscopy showed that the phenomenon of agglomeration of the modified carbon nanotubes was greatly improved. On the other hand, the modified carbon nanotubes were able to Well dispersed, the mechanical properties and electrical properties of composite materials are thus significantly improved. The tensile strength of the composites increased from 48.2 MPa to 56.7 MPa with the addition of 1.0% modified carbon nanotubes, and the conductivity increased to 1.5 × 10 -8 Ω · cm. At 1.74% to 0.56% after modification. In addition, the heat treatment process also has an impact on the electrical conductivity of the composite material, which is related to the ability to reconstruct the electrically conductive network extruded by the amorphous region of the polylactic acid after the heat treatment.