碳纳米管无溶剂纳米流体对环氧树脂力学性能及阻尼性能的影响

为降低多壁碳纳米管(MWNTs)在树脂基体中的团聚程度,提高树脂基体的机械性能,以酸化多壁碳纳米管为核,接枝颈状层硅烷偶联剂(KH560)和冠状层聚醚胺(M2070),得到碳纳米管无溶剂纳米流体(MWNTs-C-M2070)。采用傅里叶红外光谱、流变分析和透射电子显微镜对其结构进行表征。结果表明,颈状层和冠状层成功接枝于碳纳米管表面,在测试范围内其损耗模量始终大于储能模量,说明其液体特征。以合成的MWNTs-C-M2070作为改性剂加入环氧树脂基体中,研究其力学性能及阻尼性能。结果表明:当MWNTs-C-M2070加入量为2%～4%(质量分数)时,树脂基体的力学性能和阻尼性能都能得到良好的改善。与传统碳纳米管填料相比,MWNTs-C-M2070无需超声辅助即可在树脂及溶剂中实现稳定的分散,在复合材料的工业生产中有较大应用价值。

Effect of Carbon Nanotube Solvent-Free Nanofluids on Mechanical Properties and Damping Properties of Epoxy Resin

In order to prevent the aggregation of multi-walled carbon nanotubes (MWNTs) in the resin and improve mechanical properties of the resin, carbon nanotube solvent-free nanofluids (MWNTs-C-M2070) are obtained by grafting silane coupling agent (KH560) and polyether amine (M2070) to carboxylic MWNTs. Carboxylic MWNTs are the core, and KH560 and M2070 are the corona and the canopy, respectively. MWNTs-C-M2070 is characterized by Fourier transform-infrared spectrometer, rheological analysis, and transmission electron microscope. The results show that the corona and the canopy are successfully grafted on the surface of carbon nanotubes, and the loss modulus is always greater than the storage modulus, which indicates the liquid characteristics of MWNTs-C-M2070. The mechanical properties and damping properties of the epoxy matrix with MWNTs-C-M2070 added as the modifier are studied. The mechanical and damping properties of the epoxy matrix are improved well when the mass fraction of added MWNTs-C-M2070 is between 2% and 4%. Compared with traditional carbon nanotube fillers, MWNTs-C-M2070 can be well dispersed in resins and solvents without ultrasonic assistance, so it has great application value in industrial production of composite materials.