氧化石墨烯浓度对氧化石墨烯天然橡胶纳米复合材料电力学性能的影响

D. N. P. I. Chathuranga, R. C. L De Silva, L. D. C Nayanajith, A. M. K. L. Abeykoon, H. C. D. P Colombage, M. H. T. Dulaj, I. R. M Kottegoda
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摘要

通过改变还原氧化石墨烯(rGO)与天然橡胶(NR)的比例,制备了天然橡胶(NR)纳米复合材料,旨在改善天然橡胶的电学和力学性能。以高纯度斯里兰卡脉石墨为原料,经氧化还原制备氧化石墨烯。利用傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)和x射线衍射(XRD)技术对所制备的纳米复合材料进行了表征。SEM图像显示了纳米复合材料的均匀表面,FTIR和XRD光谱特征分别证实了其化学功能和结构特征。机械性能,如拉伸应力&研究了纳米复合材料的应变、断裂伸长率、硬度、杨氏模量和应变。在这里,电导率是用双探针法测量的。当橡胶中氧化石墨烯含量为2%时,纳米复合材料开始导电,并随着氧化石墨烯含量的增加而导电。随着橡胶中氧化石墨烯含量的增加,复合材料的硬度不断提高。除了抗拉强度和断裂伸长率外,杨氏模量也随着还原氧化石墨烯含量的增加而增加,并在特定比例下进行了优化。当还原氧化石墨烯含量为1.5%时,强度最高,为15.91MPa。据我们所知,对还原氧化石墨烯/NR纳米复合材料的详细性能研究尚未见报道。因此,这项研究预计将很好地支持未来的工业发展,包括电子、电气设备、电池、电容器以及包括航空航天和汽车在内的重型设备。
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Effects of rGO Concentration on Electrical and Mechanical Properties of rGO Natural Rubber Nanocomposite
Nanocomposites of natural rubber (NR) with reduced graphene oxide (rGO) were prepared by varying their ratios intending to improve the electrical and mechanical properties of natural rubber. rGO was prepared through oxidation and subsequent reduction of high purity Sri Lankan vein graphite. The prepared nanocomposites were characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques. The SEM images viewed a uniform homogeneous surface of the nanocomposite while FTIR and XRD spectral signatures substantiated its chemical functionalities and structural traits respectively. Mechanical properties such as tensile stress & strain, elongation at break, hardness, Young's modulus, and strain of the nanocomposite, were also investigated. Here the electrical conductivity was measured using the two-probe method. The nanocomposite started conducting at 2% rGO in rubber and increased conducting with increasing rGO. The hardness of the composites continuously increased with increasing rGO in rubber. Despite the tensile strength and elongation at break, Young's modulus also increased with increasing the rGO percentage up to 1.5 % and was optimized at the particular ratio. The highest strength of 15.91MPa was obtained at 1.5% of rGO. A detailed property investigation of rGO/NR nanocomposite has not been reported previously for the best of our knowledge. Hence, the study expected to be well supportive for future industrial developments including electronics, electrical devices, batteries, capacitors, as well as in heavy equipment including aerospace and automobiles.
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