Effects of stretching on mechanical properties of aligned multi-walled carbon nanotube/epoxy composites
Effects of stretching on mechanical properties of aligned multi-walled carbon nanotube/epoxy composites
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DOI：
10.1016/j.compositesa.2014.05.013
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发表时间：
2014-09
影响因子：
8.7
通讯作者：
T. Nam;K. Goto;H. Nakayama;Kahori Oshima;V. Premalal;Y. Shimamura;Y. Inoue;K. Naito;Satoshi Kobayashi
中科院分区：
文献类型：
--
作者：
T. Nam;K. Goto;H. Nakayama;Kahori Oshima;V. Premalal;Y. Shimamura;Y. Inoue;K. Naito;Satoshi Kobayashi
采用热熔体预浸料工艺制备了不同取向多壁碳纳米管(MWCNT)片材与环氧树脂的复合材料。利用拉伸和缠绕技术从MWCNT阵列中制备了取向的MWCNT片。片状碳纳米管在复合材料中的增强效果有限。因此，本研究对MWCNT片材及其预浸料进行了机械拉伸。MWCNT片材的机械拉伸和MWCNT/环氧预浸料的热拉伸显著提高了复合材料的力学性能。拉伸后复合材料力学性能的改善源于MWCNT体积分数的增加和拉伸引起的MWCNT波纹度的降低。在本研究中，当拉伸比为3%时，MWCNT/环氧复合材料具有最佳的力学性能。尽管预浸料的热拉伸显著提高了复合材料的拉伸强度和弹性模量，但其拉伸效率低于拉伸MWCNT片材的效率。
Composites based on epoxy resin and differently aligned multi-walled carbon nanotube (MWCNT) sheets have been developed using hot-melt prepreg processing. Aligned MWCNT sheets were produced from MWCNT arrays using the drawing and winding technique. Wavy MWCNTs in the sheets have limited reinforcement efficiency in the composites. Therefore, mechanical stretching of the MWCNT sheets and their prepregs was conducted for this study. Mechanical stretching of the MWCNT sheets and hot stretching of the MWCNT/epoxy prepregs markedly improved the mechanical properties of the composites. The improved mechanical properties of stretched composites derived from the increased MWCNT volume fraction and the reduced MWCNT waviness caused by stretching. With a 3% stretch ratio, the MWCNT/epoxy composites achieved their best mechanical properties in this study. Although hot stretching of the prepregs increased the tensile strength and modulus of the composites considerably, its efficiency was lower than that of stretching the MWCNT sheets.