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将氧化石墨烯(GO)在氢氧化钾/二甲基亚砜中分散并与对位芳纶聚对苯二甲酰对苯二胺(PPTA)聚阴离子分散液混合得到稳定分散的复合分散液,将该复合分散液通过去离子水处理并利用自组装方法制备由直径为40 nm左右的高长径比芳纶纳米纤维(ANFs)和表面无羧基、羟基含量相对增多的部分脱氧GO(DGO)组成的复合薄膜。对系列复合薄膜进行电子显微镜观察和光谱学分析发现ANFs与DGO间通过氢键和π–π堆叠相互作用紧密结合形成多层结构。采用纳米压痕技术测试旋涂自组装方法制备的薄膜的微观力学性能,发现薄膜弹性模量和纳米硬度在GO用量为PPTA质量的1.5%时,分别达到了32 GPa和1.5 GPa,较未加GO的ANFs提升了104%和87.5%,表明ANFs与GO形成的DGO之间具有较强的协同增强作用。这种具有高硬度、高弹性模量的新型复合材料有望在个体防护、船壳材料、航空航天等领域发挥重要作用。
Graphene oxide (GO) was dispersed in potassium hydroxide / dimethyl sulfoxide and mixed with a para-aramid poly-p-phenylene terephthalamide (PPTA) polyanion dispersion to obtain a stable dispersed composite dispersion , The composite dispersion was treated with deionized water and prepared by self-assembly method by a diameter of about 40 nm high aspect ratio aramid nanofibers (ANFs) and the surface of the carboxyl group, the relative increase in the hydroxyl content of partially deoxy GO (DGO ) Composition of the composite film. Electron microscopy and spectroscopic analysis of the series of composite films revealed that the ANFs and DGO were tightly combined to form a multilayer structure through hydrogen bonding and π-π stacking interaction. The nano-indentation technique was used to test the micro-mechanical properties of thin films prepared by spin-coating self-assembly method. The results showed that the elastic modulus and nano-hardness of films reached 32 GPa and 1.5 GPa respectively when the amount of GO was 1.5% The ANFs for GO improved by 104% and 87.5%, indicating that there is a strong synergistic effect between ANFs and DGO formed by GO. This new composite material with high hardness and high modulus of elasticity is expected to play an important role in personal protection, hull material, aerospace and other fields.