Functionalized graphene has a promising prospect in improving the thermal, mechanical, and flame‐retardant properties of polymer composites, which was unfortunately limited by the low yield and high pollution during graphene production. In this study, we reported a facile and eco‐friendly electrochemical approach to prepare ferric diethylenetriaminepentakis (methylphosphonic acid) functionalized graphene nanosheets (FGNS), which were subsequently used to fabricate polyacrylonitrile (PAN) composite fibers by a wet spinning strategy. Composite fibers showed better thermal stability above 350°C in contrast to pure PAN. Furthermore, a significant improvement on flame‐retardant properties of PAN fibers in the case of peak heat release rate (decreased by 36.7%) was caused by the inclusion of FGNS. The analysis results of condensed phase revealed that FGNS facilitated the formation of the compact and graphitic char residues, protecting underlying composite fibers during combustion. With adding 3.0 wt% FGNS, the tensile strength and breaking elongation of PAN composite fibers achieved 67.6% and 126.5% increment, respectively. This electrochemical method provides an eco‐friendly approach for scale production of functional graphene.

中文翻译：

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石墨烯纳米片的同时电化学剥离和功能化：聚丙烯腈复合纤维在热，阻燃和机械性能方面的多功能增强

功能化石墨烯在改善聚合物复合材料的热，机械和阻燃性能方面具有广阔的前景，但不幸的是，石墨烯生产过程中的低收率和高污染限制了它的发展。在这项研究中，我们报道了一种简便且环保的电化学方法，以制备二亚铁三亚胺五akisakis（甲基膦酸）功能化的石墨烯纳米片（FGNS），随后将其用于通过湿纺策略制备聚丙烯腈（PAN）复合纤维。与纯PAN相比，复合纤维在350°C以上显示出更好的热稳定性。此外，由于加入了FGNS，在峰值放热率（降低了36.7％）的情况下，PAN纤维的阻燃性能有了显着改善。凝结相的分析结果表明，FGNS有助于形成致密的石墨焦渣，在燃烧过程中保护了下面的复合纤维。加入3.0 wt％FGNS，PAN复合纤维的拉伸强度和断裂伸长率分别达到67.6％和126.5％。这种电化学方法为规模生产功能性石墨烯提供了一种生态友好的方法。