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Electrical and rheological percolation of polymer nanocomposites prepared with functionalized copper nanowires

机译：用功能化铜纳米线制备的聚合物纳米复合材料的电和流变渗透

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摘要

The morphological, electrical and rheological characterization of polystyrene nanocomposites containing copper nanowires (CuNWs) functionalized with 1-octanethiol is presented. Characterization by SEM and TEM shows that surface functionalization of the nanowires resulted in significant dispersion of CuNWs in the PS matrix. The electrical characterization of the nanocomposites indicates that functionalized CuNWs start to form electrically conductive networks at lower concentrations (0.25 vol% Cu) than using unfunctionalized CuNWs (0.5 vol% Cu). The organic coating on the nanowires prevents significant changes in the electrical resistivity in the vicinity of the percolation threshold. Percolated nanocomposites showed electrical resistivity in the range of 10(6)-10(7) Omega cm. The transition from liquid-like to solid-like behavior (rheological percolation) of the nanocomposites was studied using dynamic rheology at 200 degrees C. Unfunctionalized CuNWs result in electrical and rheological percolation at similar concentrations. Functionalized CuNWs show rheological percolation at higher concentration (1.0-2.0 vol%) than that required for electrical percolation. This is attributed to the decrease in the interfacial tension between nanowires and polymer chains and its effect on the viscoelastic behavior of the combined polymer-nanowire networks.
机译：提出了由1-辛烷硫醇官能化的包含铜纳米线（CuNWs）的聚苯乙烯纳米复合材料的形态，电学和流变学表征。通过SEM和TEM表征表明，纳米线的表面功能化导致CuNWs在PS基质中的显着分散。纳米复合材料的电学特征表明，与使用未官能化的CuNWs（0.5％（体积））相比，官能化的CuNWs可以在更低的浓度（0.25％（体积）Cu）下开始形成导电网络。纳米线上的有机涂层可防止渗透阈值附近的电阻率发生明显变化。渗透的纳米复合材料的电阻率在10（6）-10（7）Ω厘米范围内。使用200摄氏度下的动态流变学研究了纳米复合材料从液体状转变为固体状（流变渗流）的过程。未官能化的CuNWs在相似的浓度下会导致电和流变渗流。功能化的CuNWs在较高浓度（1.0-2.0％（体积））下的流变渗透性比电渗透所需的高。这归因于纳米线和聚合物链之间的界面张力的减小及其对聚合物-纳米线组合网络的粘弹性行为的影响。

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