Enhanced Tensile Strength of Monolithic Epoxy with Highly Dispersed TiO₂-Graphene Nanocomposites

• Main Authors: Yanshuai Wang, Siyao Guo, Biqin Dong, Feng Xing
• Format: Article
• Language: English
• Published: MDPI AG 2021-07-01
• Series: Journal of Composites Science
• Subjects: graphene; in-situ titania intercalation; dispersity; epoxy; tensile strength
• Online Access: https://www.mdpi.com/2504-477X/5/7/191

The functionalization of graphene has been reported widely, showing special physical and chemical properties. However, due to the lack of surface functional groups, the poor dispersibility of graphene in solvents strongly limits its engineering applications. This paper develops a novel green “in-situ titania intercalation” method to prepare a highly dispersed graphene, which is enabled by the generation of the titania precursor between the layer of graphene at room temperature to yield titania-graphene nanocomposites (TiO₂-RGO). The precursor of titania will produce amounts of nano titania between the graphene interlayers, which can effectively resist the interfacial van der Waals force of the interlamination in graphene for improved dispersion state. Such highly dispersed TiO₂-RGO nanocomposites were used to modify epoxy resin. Surprisingly, significant enhancement of the mechanical performance of epoxy resin was observed when incorporating the titania-graphene nanocomposites, especially the improvements in tensile strength and elongation at break, with 75.54% and 176.61% increases at optimal usage compared to the pure epoxy, respectively. The approach presented herein is easy and economical for industry production, which can be potentially applied to the research of high mechanical property graphene/epoxy composite system.