Ti3C2Tx MXene-modified domestic high-modulus high-strength carbon fibers based on electrophoretic deposition method
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摘要: 为提升国产高模高强碳纤维的表面特性及其复合材料的界面性能,采用连续化电泳沉积工艺,在国产高模高强碳纤维(BHM5碳纤维)表面构筑Ti3C2Tx MXene纳米片层。通过SEM、XPS、动态接触角、INSTRON万能材料试验机对改性前、后BHM5碳纤维的表面形态、表面元素含量、表面润湿性及其复合材料的力学性能和断面形貌进行了表征,探讨了Ti3C2Tx MXene改性BHM5碳纤维复合材料的界面增强机制。结果表明,经Ti3C2Tx MXene改性后的BHM5碳纤维表面粗糙度和比表面积增加,具备了与环氧树脂基体良好的机械互锁能力。碳纤维表面极性基团的含量明显上升,表面润湿性得以增强。在15 V电压下对BHM5碳纤维处理2 min后,其复合材料的层间剪切强度达到82.54 MPa,相较于未处理的碳纤维制成的复合材料,提升了28.2%。
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关键词:
- 高模高强碳纤维 /
- 电泳沉积 /
- 复合材料 /
- Ti3C2Tx MXene /
- 界面性能
Abstract: In order to improve the surface properties of domestic high-modulus high-strength carbon fibers and the interfacial properties of their composites, Ti3C2Tx MXene nanosheets were constructed on the surface of domestic high-modulus high-strength carbon fibers (BHM5 carbon fibers) using a continuous electrophoretic deposition process. The surface morphology, surface element content, surface wettability of BHM5 carbon fibers and the mechanical properties and cross-section morphology of their composites before and after modification were characterized by SEM, XPS, dynamic contact angle, and INSTRON universal material tester, and the interfacial enhancement mechanism of the Ti3C2Tx MXene-modified BHM5 carbon fiber composites was investigated. The results show that the surface roughness and specific surface area of the Ti3C2Tx MXene-modified BHM5 carbon fibers increase, possessing a good mechanical interlocking ability with the epoxy resin matrix. The content of polar groups on the surface of the carbon fiber increases significantly, and the surface wettability is enhanced. After treating the BHM5 carbon fibers at 15 V for 2 min, the interlaminar shear strength of the composites reaches 82.54 MPa, which is enhanced by 28.2% compared with the composites made of untreated carbon fibers. -
图 3 Ti3AlC2 MAX (a)、多层Ti3C2Tx MXene (b)、少层Ti3C2Tx MXene (c)的SEM图像;较高浓度Ti3C2Tx MXene溶液(d)、较低浓度Ti3C2Tx MXene溶液(e)的实物图;Ti3AlC2 MAX 和Ti3C2Tx MXene的XRD图谱(f);Ti3C2Tx MXene的XPS广谱图(g)、C1s分峰拟合图谱(h)、O1s分峰拟合图谱(i)
Figure 3. SEM images of Ti3AlC2 MAX (a), multilayer Ti3C2Tx MXene (b), few-layer Ti3C2Tx MXene (c); Physical photos of higher concentration Ti3C2Tx MXene solution (d), lower concentration Ti3C2Tx MXene solution (e); XRD pattern of Ti3AlC2 MAX and Ti3C2Tx MXene (f); XPS broad spectrum of Ti3C2Tx MXene (g), C1s split peak fitting pattern (h), O1s split peak fitting pattern (i)
表 1 样品命名
Table 1. Naming of sample
Sample Deposition voltage/V BHM5-U/EP 0 BHM5-MX5/EP 5 BHM5-MX10/EP 10 BHM5-MX15/EP 15 BHM5-MX20/EP 20 BHM5-MX25/EP 25 表 2 不同电压下碳纤维负载MXene质量
Table 2. Mass of carbon fiber loaded MXene at different voltages
Deposition voltage/V Carbon fiber initial mass/mg Modified carbon fiber mass/mg Load MXene mass/mg 5 159.7 163.4 3.7 10 160.2 166.5 6.3 15 160.1 168.2 8.1 20 160.3 170.1 9.8 25 160.6 171.1 10.5 表 3 BHM5-U 和 BHM5-MX15表面活性官能团的相对含量
Table 3. Relative content of surface-active functional groups of BHM5-U and BHM5-MX15
BHM5 C—O at 286.1 eV C=O at 287.6 eV O—C=O/C—F at 289.1 eV BHM5-U 12.50wt% 2.18wt% 0.09wt% BHM5-MX15 11.17wt% 22.92wt% 0.02wt% -
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