Chemical grafting of graphene onto carbon fiber to produce composites with improved interfacial properties via sizing process: A step closer to industrial production

• Published in: Composites science and technology 2023-01, Vol.231, p.109822, Article 109822
• Main Authors: Li, Nan, Cheng, Shan, Wang, Bing, Zong, Lishuai, Bao, Qingguang, Wu, Guangshun, Hu, Fangyuan, Wang, Jinyan, Liu, Cheng, Jian, Xigao
• Format: Article
• Language: English
• Subjects: Carbon fibre; Interface/interphase; Polymer-matrix composites
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2022.109822

The previous results indicated that the bonding strength between graphene and carbon fiber (CF) has a greater impact on the reinforcement efficiency. And chemical bonding can provide the maximum bonding force between graphene and CF, which usually requires a series of complicated processes and a long preparation time. In this research, we have established a direct and efficient method to manufacture Graphene/CF hierarchical reinforcement based on chemical bonding. The Graphene/CF hierarchical reinforcement was prepared by the means of the rapid insertion and addition reaction of diaryl carbene. FTIR, Raman, XPS, XRD confirmed the structure of graphene and CF. Graphene-modified multi-scale composites exhibit excellent comprehensive properties, including ILSS (97.2 MPa), flexural strength (2043 MPa) and Tg (240 °C), which are increased by 23.2%, 34.4%, and 13 °C, respectively. This protocol was considered to provide an alternative strategy for the rapid and large-scale manufacturing of graphene/CF hierarchical reinforced materials based on covalent bonds. [Display omitted] •A nondestructive and fast method for Graphene/CF reinforcement preparation.•The reinforcement was prepared by rapid insertion and addition reaction of diaryl carbene.•Sizing and chemical grafting are carried out at the same time (only 60 s).•Graphene/CF reinforcement can optimize the mechanical properties of composites.•The heat resistance of the composite material is improved, and Tg is increased to 240 °C.