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通过比较不同长径比的多壁纳米碳管复合硅橡胶的渗流特性发现长径比大于10000(长200μm,直径20nm)的长纳米碳管具有与长径比小于100(长2μm,直径20nm)的短纳米碳管显著不同的渗流特性,测量发现:随着导电相质量分数的增加,短纳米碳管呈现压阻系数由正到负的变化规律,而长纳米碳管即使导电相体积分数较低时也未呈现单调正的压阻系数,通过比较TEM和SEM照片,渗流曲线图以及对实验结果的分析,表明导电相的形貌对弹性体复合材料的压阻特性有很大影响。测量还表明对应最显著压阻变化率的质量分数长,短纳米碳管复合硅橡胶明显高于短纳米碳管复合硅橡胶,并且具有更高的压阻重复性,其在高体积分数下的高压阻敏感性、高补强作用及高压阻重复性使得该材料能用于柔性力敏传感器。
Through comparing the seepage characteristics of multi-walled carbon nanotube composite silicone rubber with different aspect ratios, it is found that long carbon nanotubes with an aspect ratio greater than 10000 (200 μm in length and 20 nm in diameter) have a ratio of length to diameter of less than 100 (length 2 μm, diameter 20 nm) The results show that with the increase of the mass fraction of conductive phase, the short carbon nanotubes show the variation of the piezoresistive coefficient from positive to negative, while the long carbon nanotubes even if the volumn fraction of conductive phase The results show that the morphology of the conductive phase has a great influence on the piezoresistive properties of the elastomer composites by comparing TEM and SEM photographs, seepage curves and the experimental results. The measurements also showed that for the mass fraction of the most significant rate of change in piezoresistive, the short carbon nanotube composite silicone rubber was significantly higher than the short carbon nanotube composite silicone rubber and had a higher piezoresistance and reproducibility. Under high volume fraction High pressure resistance, high reinforcement and high pressure repeatability make this material suitable for flexible force-sensitive sensors.