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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Epoxy Composites with Reduced Graphene Oxide–Cellulose Nanofiber Hybrid Filler and Their Application in Concrete Strain and Crack Monitoring
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Epoxy Composites with Reduced Graphene Oxide–Cellulose Nanofiber Hybrid Filler and Their Application in Concrete Strain and Crack Monitoring

机译：还原型氧化石墨烯-纤维素纳米纤维混合填料的环氧复合材料及其在混凝土应变和裂缝监测中的应用

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摘要

Advances in nanotechnology have provided approaches for the fabrication of new composite materials for sensing. Flexible sensors can make up for the shortcomings of traditional strain sensors in monitoring the surface strain and cracks of concrete structures. Using reduced graphene oxide (RGO) as a conductive filler, cellulose nanofiber (CNF) as a dispersant and structural skeleton, and waterborne epoxy (WEP) as a polymer matrix, a flexible composite material with piezoresistive effect was prepared by the solution blending and solvent evaporation method. The mechanical, electrical, and electromechanical properties of the composite were investigated. The results show that CNF can significantly improve the dispersion of RGO in the WEP matrix and help to form stable reinforcing and conductive networks, leading to great changes in the mechanical properties and resistivity of the composite. The composite film can withstand large deformations (>55% strain), and the resistance change rate demonstrates a high sensitivity to mechanical strain with a gauge factor of 34–71. Within a 4% strain range, the piezoresistive property of the composite is stable with good linearity and repeatability. The performance of the flexible film sensor made of the composite is tested and it can monitor the strain and crack of the concrete surface well.
机译：纳米技术的进步为新型传感复合材料的制造提供了途径。柔性传感器可以弥补传统应变传感器在监测混凝土结构的表面应变和裂缝方面的不足。以还原氧化石墨烯（RGO）为导电填料，以纤维素纳米纤维（CNF）为分散剂和结构骨架，以水性环氧（WEP）为聚合物基体，通过溶液共混和溶剂制备了具有压阻效应的柔性复合材料。蒸发法。研究了复合材料的机械，电气和机电性能。结果表明，CNF可以显着改善RGO在WEP基体中的分散性，并有助于形成稳定的增强和导电网络，从而导致复合材料的机械性能和电阻率发生巨大变化。复合膜可以承受较大的变形（> 55％的应变），并且电阻变化率显示出对机械应变的高度敏感性，规整系数为34-71。在4％的应变范围内，复合材料的压阻性能稳定，具有良好的线性和可重复性。测试了由复合材料制成的柔性薄膜传感器的性能，它可以很好地监测混凝土表面的应变和裂缝。

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