ABSTRACT

The formation of three-dimensional (3D) interconnected carbon network throughout insulative polymer matrix is advantageous to elaborating electrically conductive nanocomposites. Herein, oil-in-water (O/W) Pickering emulsion stabilized by carbon nanohybrids assembled with reduced graphene oxide (RGO) and carbon nanotubes (CNTs) was utilized as a template to achieve core-shell structured poly(methyl methacrylate) (PMMA) microsphere. The effect of synthesis time on the amphiphilicity of carbon nanohybrid stabilizer is studied. Investigations on the as-prepared Pickering emulsion and the electrical conductivity of the derived carbon nanohybrid composites were directed with respect to the concentration and formulation of carbon nanohybrid stabilizer, respectively. Considering a balance between electrical and mechanical properties, 0.74 wt% of carbon nanohybrid stabilizer was used to form O/W Pickering emulsion, which was responsible for the electrical conductivity of 4 × 10⁻⁸ S m⁻¹ for the resulting RGO/CNTs/PMMA nanocomposites. The processing-structure-property relationship of carbon nanocomposites based on O/W Pickering emulsion strategy is further demonstrated in scanning electron microscopy (SEM) observation and thermo-mechanical analysis. The processing and functional synergies between GO and CNTs are identified to efficiently construct interconnected electrically conductive pathway in polymer matrix.

摘要

贯穿绝缘聚合物基质的三维 (3D) 互连碳网络的形成有利于制备导电纳米复合材料。在此，以还原氧化石墨烯 (RGO) 和碳纳米管 (CNT) 组装的碳纳米杂化物稳定的水包油 (O/W) Pickering 乳液作为模板，实现了核壳结构的聚甲基丙烯酸甲酯 (PMMA) ) 微球。研究了合成时间对碳纳米杂化稳定剂两亲性的影响。对制备的 Pickering 乳液和衍生的碳纳米杂化复合材料的电导率的研究分别针对碳纳米杂化稳定剂的浓度和配方。考虑到电气和机械性能之间的平衡，0。^-8 S m ^-1用于得到的 RGO/CNTs/PMMA 纳米复合材料。在扫描电子显微镜 (SEM) 观察和热机械分析中进一步证明了基于 O/W Pickering 乳液策略的碳纳米复合材料的加工-结构-性能关系。确定了 GO 和 CNT 之间的加工和功能协同作用，以有效地在聚合物基质中构建互连的导电通路。