Preparation and Performance of GNPs-MWCNT Conductive PolymerComposite Materials by Direct Writing 3D Printing
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摘要: 以石墨烯纳米片（GNPs）和多壁碳纳米管（MWCNT）为导电填料，以聚氧化乙烯（PEO）聚合物为基体制备得到复合材料薄膜，研究了不同GNPs/MWCNT填充量及配比对复合材料形貌、透光率、导电性和压阻特性的影响。结果表明：随GNPs/MWCNT填充量增加，复合材料表面包覆的PEO聚合物减少，导电填料连通性能增强；填充GNPs/MWCNT后，复合材料透光率降至50%以下，填料质量分数和配比变化对透光性的影响不大；随GNPs/MWCNT填充量和配比增加，复合材料导电性能显著提升；当GNPs/MWCNT填充质量分数为10%、配比（质量比）为1：1时，复合材料压敏性能最优，且其前驱体溶液稳定性较好，连续打印能力优良，能够进行大面积喷印制造。Abstract: Composite films with graphene nanosheets (GNPs) and multi-walled carbon nanotubes (MWCNT) as conductive fillers and polyethylene oxide (PEO) polymer as matrix were prepared. The effects of different filling content and ratios of GNPs/MWCNT on morphology, light transmittance, electrical conductivity and piezoresistive properties of composite film were studied. The results show that with the increase of GNPs/MWCNT filling content, the PEO polymer on composite material surface decreased, and the connectivity of conductive fillers increased. The light transmittance of composite material was reduced to below 50% after filling with GNPs/MWCNT, and the change of filler mass fraction and ratio had little effect on the light transmittance. The electrical conductivity of composite material was significantly improved with the increase of GNPs/MWCNT filling content and ratio. The composite material showed the best pressure-sensitive performance when the GNPs/MWCNT filling mass fraction was 10% and the mass ratio was 1:1, and the test precursor solution had good stability, excellent continuous printing ability, and could be used for large-area printing.
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