共价有机骨架纳米材料的制备及摩擦学性能研究

利用三聚氯氰和2,5-二氨基-苯并-二噻唑为原料，通过简单的溶剂热法反应制备了一类新型的共价有机骨架纳米材料(简称TTC)，该纳米材料具有二维的层状结构，在水和聚乙二醇400(PEG 400)混合润滑体系中呈现出良好的分散性. 摩擦学试验表明，添加质量分数为0.5% 时，TTC可显著降低钢-钢摩擦对偶上的摩擦系数和磨损体积. 摩擦学机制研究表明三嗪环和苯并噻唑环结构高的π电子云密度使TTC与金属铁原子/离子间产生强的相互作用，同时硫原子高的亲合力进一步协同形成稳定的摩擦膜，此外，TTC层间弱的范德华力降低了横向剪切强度，层内共价键保证了润滑膜的力学强度.

A novel class of covalent organic framework nanomaterials (abbreviated as TTC) was prepared via a facile solvothermal reaction using cyanuric chloride and 2,5-diamino-benzo-bisthiazole as raw materials. The as-prepared nanomaterials possess a two-dimensional layered structure and exhibit excellent dispersibility in a mixed lubrication system consisting of water and polyethylene glycol 400 (PEG 400). Tribological tests show that when the mass fraction of TTC is 0.5%, it can remarkably reduce the friction coefficient and wear volume of steel-steel friction pairs. Research on the tribological mechanism indicates that the high π-electron cloud density of the triazine ring and benzothiazole ring structures enables strong interactions between TTC and metallic iron atoms/ions. Meanwhile, the high affinity of sulfur atoms further synergistically contributes to the formation of a stable tribofilm. Additionally, the weak van der Waals forces between the layers of TTC lower the transverse shear strength, while the covalent bonds within the layers guarantee the mechanical strength of the lubricating film.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于一种新型共价有机骨架纳米材料（TTC）的制备及其摩擦学性能。通过溶剂热法制备的TTC具有二维层状结构，在混合润滑体系中表现出良好分散性，添加0.5%质量分数即可显著降低钢-钢摩擦对的摩擦系数和磨损体积。其摩擦学机制源于材料的高π电子云密度、硫原子亲合力与金属的强相互作用，以及层间弱范德华力和层内共价键的协同作用，形成稳定且力学强度高的润滑膜。