The cooperatively crosslinking between GO-COOH/TiO2 @PAO microcapsules and polyimide to improve the mechanical and tribological properties of PEEK/PI composites

• Published in: Tribology international 2024-03, Vol.191, p.109209, Article 109209
• Main Authors: Liao, Chaoying, Zhang, Zhaozhu, Yang, Mingming, Yuan, Junya, Liu, Meng, He, Yaohui, Li, Peilong, Jiang, Wei, Liu, Weimin
• Format: Article
• Language: English
• Subjects: Crosslinking; In-situ polymerization; Microcapsules; Polyimide; Tribology
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2023.109209

The PEEK fabric-reinforced polyimide resin containing microcapsules with excellent mechanical and lubrication properties is reported. The GO-COOH/TiO2 @PAO double-wall microcapsules (Capsule) were prepared by interfacial condensation polymerization of titanium butoxide (TBT) and self-assembly between GO-COOH and TiO2 shell. A double crosslink of chemical bond (amide or ester) and hydrogen bond were constructed between microcapsules and polyimide (PI) to improve the mechanical properties of PEEK fabric-reinforced polyimide resin (PEEK/PI). It was identified that the addition of Capsules induced a 12.98% decrease in friction coefficient and 56.85% in the wear rate of the composites. This superior frictional behavior was primarily attributed to the combined effect of the boundary lubrication of PAO6, load-bearing effect of TiO2 and PEEK fabric, and friction-reducing of GO-COOH. •Developed a novel containing oil microcapsules applied in lubrication.•The chemical bond and hydrogen bond was constructed between microcapsules and polyimide.•The microcapsules demonstrate good lubrication.•Regular fluctuations were observed in the friction curve of the samples containing microcapsules.