Thiadiazole functionalized covalent organic frameworks as oil-based lubricant additives for anti-friction and anti-wear

The thiadiazole functionalized covalent organic frameworks (COFs) were successfully prepared via polydopamine (PDA) as a connection layer. The fluorine-containing COF-F was synthesized via solvothermal reaction, which was subsequently wrapped with PDA layer via oxidative polymerization. Finally, the anti-wear agent thiadiazole dimer covalently bonded with PDA via the Michael addition reactions to obtain thiadiazole functionalized COFs (DTD@COF-F). The as-prepared DTD@COF-F exhibits good tribological properties as oil-based lubricant additives, representing a low and stable friction coefficient (0.104), and decreasing the wear volume by 67.8 % comparing to the base oil 500SN. The good lubrication performance mainly benefits from the robust protective tribo-film, while the anti-wear thiadiazole molecule functionalized COFs can absorb onto the friction pairs easily, hence play essential roles in its construction.

Automated summary

The thiadiazole functionalized covalent organic frameworks were synthesized using polydopamine as a connection layer. The fluorine-containing COF-F was prepared through solvothermal reaction and then coated with a PDA layer. The anti-wear agent thiadiazole dimer covalently bonded with PDA to obtain thiadiazole functionalized COFs (DTD@COF-F), which exhibited good tribological properties as oil-based lubricant additives, including a low and stable friction coefficient (0.104) and a 67.8% reduction in wear volume compared to the base oil 500SN. The excellent lubrication performance is attributed to the robust protective tribo-film and the easy absorption of the anti-wear thiadiazole molecule functionalized COFs onto the friction pairs.