Abstract Functional graphene is a very efficient support material to improve the performance of polymer composites, but the commercial application of functional graphene is hindered by its complex preparation procedure and high pollution. Herein, the water-dispersible graphene nanosheets (DGNS) were prepared by a simple and eco-friendly electrochemical method assisted with an anionic surfactant DNS86, and then DGNS were mixed into poly (vinyl alcohol) (PVA) matrix to fabricate PVA composite films. DGNS could be well dispersed in PVA matrix and form strong interfacial interaction with PVA molecular chains. The tensile strength, tensile modulus and storage modulus of PVA composite film containing 0.3 wt% DGNS were increased by 50.1%, 50.4% and 154.5%, respectively, compared to those of pure PVA. Moreover, the addition of DGNS also improved the flame retardancy of PVA composite films, achieving an obvious reduction (60.9%) in the peak heat release rate with the load of 2.0 wt% DGNS. The analysis revealed that the addition of DGNS could facilitate the formation of the compact and highly graphitic char residues, retarding the heat and mass transfer to protect underlying matrix during combustion process. This paper will supply a promising strategy to industrially produce functionalized graphene nanosheets for graphene-based reinforced composites.

中文翻译：

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从石墨中电化学剥离水分散性石墨烯以增强聚乙烯醇复合材料的机械和阻燃性能

摘要 功能石墨烯是一种非常有效的提高聚合物复合材料性能的载体材料，但其制备工艺复杂、污染严重，阻碍了功能石墨烯的商业化应用。在此，水分散性石墨烯纳米片（DGNS）是通过简单且环保的电化学方法在阴离子表面活性剂 DNS86 的辅助下制备的，然后将 DGNS 混合到聚乙烯醇（PVA）基质中以制备 PVA 复合薄膜。DGNS 可以很好地分散在 PVA 基质中，并与 PVA 分子链形成强烈的界面相互作用。与纯PVA相比，含有0.3 wt% DGNS的PVA复合膜的拉伸强度、拉伸模量和储能模量分别提高了50.1%、50.4%和154.5%。而且，DGNS的加入还提高了PVA复合薄膜的阻燃性，在2.0 wt% DGNS负载下，峰值放热率明显降低（60.9%）。分析表明，添加 DGNS 可以促进致密且高度石墨化的炭残留物的形成，减缓热量和质量传递，以在燃烧过程中保护下层基体。本文将为工业化生产用于石墨烯基增强复合材料的功能化石墨烯纳米片提供一种有前景的策略。在燃烧过程中延迟热量和质量传递以保护下面的基质。本文将为工业化生产用于石墨烯基增强复合材料的功能化石墨烯纳米片提供一种有前景的策略。在燃烧过程中延迟热量和质量传递以保护下面的基质。本文将为工业化生产用于石墨烯基增强复合材料的功能化石墨烯纳米片提供一种有前景的策略。