Ga基液态金属@COFs的制备及其聚酰亚胺复合涂层的摩擦学性能

Preparation of Ga-based liquid metal @COFs and tribological properties of its polyimide composite coatings

摘要:

本文采用具有多孔结构且有机相容性良好的共价有机框架聚合物（COFs）对镓基液态金属（GLM）进行包覆，制备了GLM@COFs固-液复合润滑微胶囊，并进一步将其加入聚酰亚胺（PI）中制备出GLM@COFs/PI复合涂层。研究表明：成功制备出球形结构的GLM@COFs固-液复合润滑微胶囊。当GLM@COFs添加量（质量分数）为0.9%时，GLM@COFs/PI复合涂层的摩擦学性能最优，摩擦系数和体积磨损率分别为0.22和6.3×10-6 mm3/(N·m)。与PI涂层相比，分别降低了35.3%和61.1%。这主要归因于COFs包覆GLM不仅可以有效地改善GLM与PI基体的相容性，而且可以有效地发挥COFs与GLM协同减摩和耐磨的作用。

Abstract:

In this paper, gallium-based liquid metal (GLM) was coated with covalent organic framework polymers (COFs) with porous structure and good organic compatibility, and GLM@COFs solid-liquid composite lubricating microcapsules were prepared, and the GLM@COFs/PI composite coating was prepared by adding them to polyimide (PI). The results show that the spherical structure of GLM@COFs-solid-liquid composite lubrication microcapsules has been successfully prepared. When the GLM@COFs addition amount (mass fraction) was 0.9%, the tribological properties of the GLM@COFs/PI composite coating were the best, with the friction coefficient and volume wear rate of 0.22 and 6.3×10-6 mm3/(N·m), respectively. Compared to PI coating, it was reduced by 35.3% and 61.1%, respectively. This is mainly due to the fact that COFs-coated GLM can not only effectively improve the compatibility between GLM and PI matrix, but also effectively play the role of synergistic friction reduction and wear resistance between COFs and GLM.