离子液体
摩擦学
制作
聚合
材料科学
表面改性
化学工程
高分子化学
化学
聚合物
复合材料
有机化学
催化作用
医学
替代医学
病理
工程类
作者
Xiaozhi Zhang,Tiantian Wang,William Yi Wang,Yaojie Yan,Shenghua Xue,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
标识
DOI:10.1016/j.cej.2024.152665
摘要
Recently, covalent organic frameworks (COFs) have been extensively studied due to their abundant active sites for functionalization and the derived various applications. Herein, we prepared poly(ionic liquid) functionalized COFs via mechanochemical reaction to bond with initiator and the following surface-initiated polymerization. Firstly, the initiator 2-bromo-2-methylpropionyl bromide bonded with the hydroxyl group of DT-COF through ball milling driven mechanochemical reaction, then the ionic liquid monomer (IL-Cl) can grow on COF skeleton from the active sites of initiator via surface-initiated atom transfer radical polymerization (SI-ATRP) to obtain the poly(ionic liquid) functionalized COF (PIL-Cl@DT-COF). The as-prepared PIL-Cl@DT-COF as well as the PIL-PF6@DT-COF sample after anion exchange with PF6− served as oil-based lubricant additives, significantly reducing the friction coefficient and wear volume of base oil PAO10, especially PIL-PF6@DT-COF can reduce the average friction coefficient from 0.169 to 0.094 and decrease the wear volume by 82.9 %. The outstanding tribological properties mainly benefited from the tough protective tribo-film, which was built via tribological reaction on the friction interface, containing the absorbed PIL-PF6@DT-COF, ferric oxides and anti-wear F, P compounds.
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