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首页> 外文期刊>Journal of Applied Polymer Science >Nonlinear surface electrical resistivity of graphite-polyurethane composite films
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Nonlinear surface electrical resistivity of graphite-polyurethane composite films

机译：石墨-聚氨酯复合薄膜的非线性表面电阻率

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In this article, we study the surface resistivity of graphite-polyurethane composites using voltage-current characteristics. The evolution of the percolation network of graphite in polyurethane is qualitatively studied using optical micrographs. As expected, the surface resistivity decreases as a function of graphite concentration. In particular, the surface resistivity of the 69% graphite-polyurethane composite is about four orders of magnitude lower than the surface resistivity of the 27% graphite-polyurethane composite. The electrical resistivity of the composite is found to be highly nonlinear with respect to an increasing voltage at a low graphite weight fraction. On the other hand, the nonlinearity is significantly milder at higher weight fractions. The reasons behind the nonlinearity are discussed. Very preliminary studies indicate that very low weight fractions of single wall carbon nanotubes (e.g. 2.5%) are sufficient to generate electrical conductivities comparable to much higher loading fractions (similar to 60% and higher) of the heavier graphite particles. (c) 2007 Wiley Periodicals, Inc.
机译：在本文中，我们利用电压-电流特性研究了石墨-聚氨酯复合材料的表面电阻率。使用光学显微照片定性研究了石墨在聚氨酯中的渗透网络的演变。正如预期的那样，表面电阻率随石墨浓度的降低而降低。特别地，69％的石墨-聚氨酯复合物的表面电阻率比27％的石墨-聚氨酯复合物的表面电阻率低大约四个数量级。发现该复合材料的电阻率相对于在低石墨重量分数下增加的电压而言是高度非线性的。另一方面，在较高的重量分数下，非线性明显减弱。讨论了非线性背后的原因。非常初步的研究表明，单壁碳纳米管的极低重量分数（例如2.5％）足以产生与较重石墨颗粒高得多的负载分数（约60％和更高）相当的电导率。 （c）2007年Wiley Periodicals，Inc.

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