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Synergistic effects and piezoresistive characteristics of carbon nanofillers/silicone rubber composites

机译：碳纳米填料/硅橡胶复合材料的协同效应和压阻特性

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摘要

Silicone rubber (SR) filled with different concentrations of carbon nanotubes (CNTs), carbon black (CB) and (CNTs/CB) hybrid fillers was fabricated by melt blending. The effects of filler type on the electrical properties and piezoresistive properties (in the region of the percolation) of the conductive SR composites were studied. Percolation threshold of CNTs, CB and (CNTs/CB) based composites was found to be 0.20, 0.255 and 0.22 volume fraction respectively. The piezoresistive sensitivity GR of these conductive SR composites, dependent on different filler types, was 0.8549, 0.7267 and 0.9361 respectively. Compared to CB/SR and CNTs/SR, CNTs/CB/SR revealed an unexpectedly high GR, which indicated that the synergistic effects have formed in CNTs/CB network. In addition, microscopic analysis (SEM) can also explain the existence of synergies. A model describing the electrical percolation of mixed carbon fillers CNTs and CB is proposed. The experimental value (0.22) of hybrid filler systems is smaller than the theoretical value (0.23), which can prove the existence of synergies once again.
机译：通过熔融共混制备了填充有不同浓度的碳纳米管（CNT），炭黑（CB）和（CNTs / CB）混合填料的硅橡胶（SR）。研究了填料类型对导电SR复合材料的电性能和压阻性能（在渗流区域）的影响。发现基于CNT，CB和（CNT / CB）的复合材料的渗透阈分别为0.20、0.255和0.22体积分数。这些导电性SR复合材料的压阻灵敏度GR分别为0.8549、0.7267和0.9361，具体取决于不同的填料类型。与CB / SR和CNTs / SR相比，CNTs / CB / SR显示出意料之外的高GR，这表明在CNTs / CB网络中已经形成了协同效应。此外，微观分析（SEM）也可以解释协同作用的存在。提出了描述混合碳填料CNTs和CB的电渗滤的模型。混合填料体系的实验值（0.22）小于理论值（0.23），可以再次证明存在协同作用。

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