Improving the thermal and mechanical properties of an alumina-filled silicone rubber composite by incorporating carbon nanotubes
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摘要: 纳米碳管由于其优异的特性可以用于改善复合材料的导热和机械性能。本文通过传统的机械混合工艺，采用氧化铝粉体和少量纳米碳管填充甲基乙烯基硅橡胶，研究了氧化铝粉体的质量分数、表面改性和纳米碳管的添加对复合材料热导率、杨氏模量和硬度的影响。结果表明：氧化铝粉体的质量分数越高，复合材料的热导率越高；当氧化铝粉体的质量分数固定时，对其表面改性和添加纳米碳管能够明显提高复合材料的热导率、杨氏模量和硬度，发现改性氧化铝和纳米碳管并用可以协同增强填料与橡胶间的界面作用，促进橡胶基底中更好的导热通道和网络结构的形成，从而改善复合材料的导热和机械性能。Abstract: Carbon nanotubes (CNTs) can be used to improve the thermal and mechanical properties of composites because of their excellent characteristics. Methyl vinyl silicone rubber matrix composites filled with alumina (Al2O3) powder and CNTs were fabricated by a conventional mechanical blending method. The effects of the mass fraction of Al2O3 powder, surface modification of Al2O3 powder by silanization with dodecyltrimethoxysilane and the addition of CNTs on the thermal conductivity, Young's modulus and hardness of the composites were investigated. Results showed that a higher mass fraction of Al2O3 powder results in a higher thermal conductivity of the composites. When the mass fraction of Al2O3 powder was fixed, the thermal conductivity, Young's modulus and hardness of the composites were obviously improved by surface modification of the powder and adding a small amount of CNTs. A combination of the modified Al2O3 filler and CNT filler improves the interfacial interaction between the fillers and rubber matrix by the formation of better heat conduction channels and network structures in the rubber matrix, thereby improving the thermal conductivity and mechanical properties of the composites.
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Key words:
- Carbon nanotubes /
- Alumina /
- Silicone rubber /
- Thermal conductivity /
- Synergistic effect
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