Irradiation treatment of multiwalled carbon nanotubes and its effect on the thermal properties of their composites with epoxy resin
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摘要: 在空气中用高频高压电子加速器辐照多壁碳纳米管(MWCNTs)，采用红外光谱、能谱分析、拉曼光谱和透射电镜表征分析辐照处理对碳纳米管结构的影响；通过原位复合法制备MWCNT/环氧树脂(EP)复合材料。采用场发射扫描电镜、热失重分析和动态力学分析研究辐照处理MWCNTs对环氧树脂热稳定性的影响。结果表明：电子束辐照处理使MWCNTs表面接入了少量的含氧基团，同时破坏了MWCNTs的完整结构，当辐照剂量为170kGy时，接枝含氧基团的量最多（约为4%），且结构破坏程度较小。与原始MWCNT/EP体系相比，经电子束辐照处理后的MWCNTs在EP中分散得更均匀，并能使材料的最大热分解温度和玻璃化转变温度较纯EP有所提高，在EP中加入质量分数0.5%的经170kGy辐照处理后的MWCNTs，能够使材料的最大热分解温度和玻璃化转变温度分别提高约14℃和8℃Abstract: Multi-walled carbon nanotubes (MWCNTs) were irradiated to different doses by high-energy electron beams. The structure of the irradiated MWCNTs was characterized by Fourier transform infrared spectroscopy, X-ray energy dispersion spectroscopy，Raman spectroscopy and transmission electron microscopy. MWCNT/epoxy composites were prepared by a cast-molding method. The effect of the irradiation on the properties of the composites was studied by scanning electron microscopy, thermogravimetry and dynamic mechanical analysis. Results showed that oxygen-containing groups were covalently bonded on the MWCNTs. The MWCNTs were collapsed and even broken after irradiation. The percentage of the oxygen-containing groups had a maximum of 4% at a radiation dose of 170kGy. It was found that the irradiated MWCNTs could be easily dispersed in epoxy resin. Addition of 0.5mass% MWCNTs irradiated with 170kGy to epoxy resin improved the glass transition temperature and the initial decomposition temperature by 8 and 14℃, respectively.
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Key words:
- Multi-walled nanotubes /
- Irradiation /
- Epoxy resin /
- Composites /
- Thermal properties
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