采用静电组装技术,制备“葡萄串”结构的炭黑(CB)/多壁碳纳米管(MWCNT)(CB/MWCNT)纳米复合材料,并以其作为导电填料,经混炼、压延和硫化后,制备柔性导电硅橡胶(SR)复合材料。分别以透射电子显微镜,扫描电子显微镜和压力-电阻测试研究不同配合比和掺量的CB和MWCNT的组装效果、分散状态和压阻特性。结果表明,CB和MWCNT的体积配合比为3:2条件下,静电组装效果最好,静电组装形成的“葡萄串”结构,可以提高CB/MWCNT/SR的导电性和压阻特性,CB/MWCNT/SR的渗流阈值为22%,施加25N压力条件下,电阻率下降约30%,CB/MWCNT/SR表现出良好的压阻特性。
Carbon black/multi-walled carbon nanotubes (CB/MWCNT) nanocomposites with “grape string” structure were prepared by electrostatic assembly technique and then used as conductive filler.The flexible conductive silicone rubber (SR) composites were prepared by mixing,rolling and vulcanizing.The assembly effect,dispersion state and piezoresistive property of CB and MWCNT with different ratio and dosage were studied by transmission electron microscopy,scanning electron microscopy and pressure-resistance test,respectively.The results showed that the electrostatic assembly effect was best when the volume ratio of CB and MWCNT were 3:2.The “grape string” structure formed by electrostatic assembly can improve the conductivity and piezoresistive characteristics of CB/MWCNT/SR.The percolation threshold of CB/MWCNT/SR was 22%.The resistivity of CB/MWCNT/SR decreased about 30% when the pressure was 25N.And the piezoresistive characteristics of CB/MWCNT/SR were excellent.
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基金资助
国家自然科学基金(51303131)
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