The fabrication of advanced graphene-based nanocomposites with high-performance polymers requires covalent modification of graphene with aromatic macromolecules. Herein, C-N coupling reactions between fluorinated graphene (FG) and aromatic polyamides containing the benzimidazole moiety are successfully achieved. The optimized conditions are presented based on the nucleophilic behavior of the C-N coupling reaction on graphene. Different from the C-N coupling reaction between two small aromatic molecules, the conformation of grafted aromatic polyamide after reaction changes from torsional to paralleled alignment on graphene with the molecular length increment. Non-covalent interactions between graphene and aromatic polyamides result in this conformational change owing to the extended π systems of graphene and aromatic polyamides, and the synergistic effect of covalent and non-covalent interactions is put forward. As a consequence, graphene dispersibility is greatly enhanced in the solution of aromatic polyamide.

中文翻译：

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石墨烯上的CN与芳族大分子的偶联反应和接枝大分子的空间构型。

具有高性能聚合物的先进石墨烯基纳米复合材料的制造需要使用芳香族大分子对石墨烯进行共价改性。在本文中，成功地实现了氟化石墨烯（FG）与含有苯并咪唑部分的芳族聚酰胺之间的CN偶联反应。基于CN偶联反应在石墨烯上的亲核行为，提出了优化条件。与两个小芳族分子之间的CN偶联反应不同，反应后接枝的芳族聚酰胺的构象随分子长度的增加从石墨烯的扭转排列变为平行排列。石墨烯和芳族聚酰胺之间的非共价相互作用导致这种构象变化，这是由于石墨烯和芳族聚酰胺的π系统扩展所致，并提出了共价和非共价相互作用的协同效应。结果，石墨烯在芳族聚酰胺溶液中的分散性大大提高。