MXene/硅橡胶复合材料的制备及导热性能

陈德家; 姚艳青; 赵佳; 柴春鹏

doi:10.13801/j.cnki.fhclxb.20210528.001

MXene/硅橡胶复合材料的制备及导热性能

doi: 10.13801/j.cnki.fhclxb.20210528.001

北京理工大学　材料学院，北京 100081

详细信息

通讯作者:
柴春鹏，博士，副教授，硕士生导师，研究方向为树脂基复合材料、吸波材料等　E-mail：chaicp@bit.edu.cn

中图分类号: TB332；TQ333.93
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出版历程
- 收稿日期: 2021-04-06
- 修回日期: 2021-05-14
- 录用日期: 2021-05-24
- 网络出版日期: 2021-05-28
- 刊出日期: 2021-03-01

Preparation and thermal conductivity of MXene/silicone rubber composites

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 随着5G时代的来临，各类电子元器件发热功率明显增大。因此，电子元器件及设备的散热问题亟待解决，使得对高导热材料的需求日益迫切。为此，利用化学刻蚀法制备二维MXene材料(Ti₃C₂T_x)，采用标准溶液共混法，将制备得到的MXene与硅橡胶复合，得到MXene/硅橡胶复合材料，研究了MXene添加量对MXene/硅橡胶导热性能的影响。使用SEM和XRD对MXene进行结构表征，并测试纯硅橡胶与MXene/硅橡胶复合材料的力学性能、导热导电性能和热稳定性等。结果表明：化学刻蚀法成功制备了呈经典“手风琴”层状结构的MXene，当MXene添加量为2.00wt%时，MXene/硅橡胶复合材料的热导率最高可达1.32 W/(m·K)，是纯硅橡胶的4.55倍，此时，体积电阻率降低4个数量级，力学性能和热稳定性也得到了显著提高。
- MXene /
- 硅橡胶 /
- 导热性能 /
- 化学刻蚀法 /
- 二维材料
Abstract: With the advent of 5G era, the heating power of various electronic components has increased significantly. Therefore, the problem of heat dissipation of electronic components and equipment needs to be solved urgently, which makes the demand for high thermal conductivity materials increasingly urgent. The two-dimensional MXene material (Ti₃C₂T_x) was prepared by chemical etching method, and the MXene/silicone rubber composites were obtained by using standard solution blending method. The effect of the addition amount of MXene on the thermal conductivity of the MXene/silicone rubber composites were studied. SEM and XRD were used to characterize the structure of MXene, and the mechanical properties, thermal conductivity and thermal stability of pure silicone rubber and the composites were tested. The results show that the classic accordion layered MXene is successfully prepared by chemical etch method. When the added MXene is 2.00wt%, the thermal conductivity of the composites is up to 1.32 W/(m·K), which is 4.55 times that of pure silicone rubber. At this time, the volume resistivity of the composites is reduced by 4 orders of magnitude. The mechanical properties and thermal stability of silicone rubber are also improved remarkably.
- MXene /
- silicone rubber /
- thermal conductivity /
- chemical etching /
- two-dimensional materials

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图 1 聚二甲基硅氧烷(PDMS)结构式

Figure 1. Polydimethylsiloxane (PDMS) structure formula

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图 2 MXene表面活性基团与硅氧烷键的相互作用

Figure 2. Interaction between MXene surface active groups and siloxane linkage

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图 3 硅橡胶与MXene/硅橡胶复合材料的数码照片

Figure 3. Digital photos of silicone rubber and MXene/silicone rubber composites

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图 4 Ti₃AlC₂粉末和MXene/硅橡胶复合材料断面的SEM图像

Figure 4. SEM images of the cross section of Ti₃AlC₂ powder and MXene/silicone rubber composites

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图 5 MXene/硅橡胶复合材料中Ti元素的EDS元素映射谱图

Figure 5. Energy spectra of EDS mapping spectra of Ti elements in MXene/silicone rubber composites

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图 6 MXene粉末和Ti₃AlC₂粉末的XRD图谱

Figure 6. XRD patterns of MXene powder and Ti₃AlC₂powder

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图 7 MXene/硅橡胶复合材料的导热系数

Figure 7. Thermal conductivity of MXene/silicone rubber composites

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图 8 MXene与硅橡胶的串联和并联热阻模型

Figure 8. Series and parallel thermal resistance models of MXene and silicone rubber

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图 9 纯硅橡胶与MXene添加量为2.00wt%的MXene/硅橡胶复合材料在N₂中的TGA曲线

Figure 9. TGA curves of pure silicone rubber and MXene/silicone rubber composite with 2.00wt% MXene content in N₂

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表 1 MXene添加量对MXene/硅橡胶复合材料力学性能的影响

Table 1. Effect of MXene content on mechanical properties of MXene/silicone rubber composites

Content of MXene/wt%	Elongation at break/%	Tensile strength/MPa
0	107±2.4	0.54±0.02
0.25	118±2.6	0.78±0.02
0.50	127±3.0	1.03±0.03
0.75	140±3.1	1.25±0.04
1.00	161±3.3	1.38±0.06
1.25	173±3.6	1.63±0.07
1.50	170±3.1	1.70±0.07
1.75	166±2.8	2.02±0.09
2.00	162±2.8	2.52±0.10

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表 2 MXene/硅橡胶复合材料的体积电阻率

Table 2. Volume resistivity of MXene/silicone rubber composites

Content of MXene/wt%	0	0.25	0.50	0.75	1.00	1.25	1.50	1.75	2.00
Volume resistivity/(10¹¹ Ω·cm)	475.70	327.57	160.76	87.06	10.21	1.63	0.69	0.20	0.07

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