亲水型功能化石墨烯的分散性及其对水泥基复合材料力学性能的影响

Dispersity of hydrophilic functional graphene and its impact on mechanical properties of cement based composites

摘要: 为了解决石墨烯纳米片在水泥基体中的分散问题，采用芳基重氮盐(F)对氧化石墨烯(GO)进行改性，制备了一种新型亲水型功能化石墨烯(FG)。结果表明，FG在水溶剂中最大的分散浓度能够达到2.1 mg/mL。FTIR、拉曼光谱和XPS结果表明F成功对石墨烯进行了表面改性。对比纯水泥基体材料，本文所制备的亲水型FG/水泥复合材料的28天抗折强度和抗压强度相对提高了95.3%和78.3%。F对GO进行改性，实现了石墨烯在水泥基材料中的均匀分散及对其力学性能的提升。

Abstract: A novel water dispersible functional graphene (FG) was synthesized by the reaction of graphene oxide (GO) with an aryl diazonium salt (F) to solve the problem of uniformly dispersity of graphene nanosheets in the cement matrix. The maximum dispersibility of FG in water is 2.1 mg/mL. The successful surface modification of graphene using F was revealed by FTIR, Raman and XPS, respectively. Compared with the pure cement materials, the 28 days flexural strength and the compressive strength of the hydrophilic FG/cement composites are increased by 95.3% and 78.3%. The FG is uniformly dispersed in the cement matrix and the mechanical properties of the hydrophilic FG/cement composites are improved by the functional reaction between graphene and F.