溶液共混法制备改性碳纳米管/尼龙12复合材料的性能研究

Performance Studies of the Modified CNTs/Nylon 12 Composites Prepared by Solution Blending

将纯碳纳米管通过浓酸氧化改性,然后通过溶液共混法制备改性碳纳米管/尼龙12复合材料的粉末.红外光谱分析表明,经过酸氧化处理,碳纳米管表面接上了羧基和羟基等极性官能团;光学图像表明改性后的碳纳米管与有机溶剂的相容性和分散性得到较好地改善;热重分析可知碳纳米管的加入提高了材料的热稳定性;力学性能测试显示碳纳米管与尼龙12通过溶液共混法制得的样品抗拉强度比熔融共混法制备的样品提高了3%.

The modified carbon nanotubes（CNTs）/nylon 12 composites was prepared by solution blending after the pure carbon nanotubes were oxidized by the concentrated nitric acid.Infrared spectrum of the CNTs after acid oxidation showed that polar functional groups were attached to the surface of CNTs.Optical images showed that compatibility and dispersion of the modified CNTs in organic solvent have been improved.TGA indicated the thermal stability of nylon 12 was improved by adding CNTs.Tensile test showed that the tensile strength of CNTs/nylon 12 by solution blending was 3 % stronger than that of the samples prepared by melt blending.