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

作　　者：刘超 唐雨凡[2] 薛新 靳子 杨仓 鲍艳 LIU Chao;TANG Yufan;XUE Xin;JIN Zi;YANG Cang;BAO Yan(College of Bioresources of Chemical&Materials Engineering,Shaanxi University of Science&Technology,Xi′an 710021,Shaanxi,China;College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,Shaanxi,China;Xi'an Key Laboratory of Green Chemicals and Functional Materials,Shaanxi University of Science&Technology,Xi′an 710021,Shaanxi,China;College of Foreign Languages,Harbin Engineering University,Harbin 150006,Heilongjiang,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,陕西西安710021 [2]陕西科技大学化学与化工学院,陕西西安710021 [3]陕西科技大学西安市绿色化学品与功能材料重点实验室,陕西西安710021 [4]哈尔滨工程大学外国语学院,黑龙江哈尔滨150006

出　　处：《精细化工》2025年第1期95-102,232,共9页Fine Chemicals

基　　金：国家自然科学基金项目(22008145);陕西省重点研发计划项目(2023-YBGY-482);陕西省教育厅重点科学研究计划项目(21JY004)。

摘　　要：采用共价有机框架聚合物(COFs)对经聚乙烯吡咯烷酮(PVP)改性的镓基液态金属(GLM)进行包覆,制备了固-液复合润滑微胶囊(GLM@COFs),将GLM@COFs加入到聚酰亚胺(PI)中制备了GLM@COFs/PI复合涂层。通过TEM、XRD和EDS对GLM@COFs的结构组成进行了表征,考察了GLM@COFs添加量〔以4,4'-二氨基二苯醚(ODA)、均苯四甲酸酐(BTDA)和GLM@COFs总质量计,下同〕对GLM@COFs/PI复合涂层摩擦学性能的影响,采用SEM和XPS探究了磨损面对涂层的磨损机理。结果表明,GLM@COFs呈平均粒径约为2μm的球形;当GLM@COFs添加量为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) mm^(3)/(N·m),与未添加GLM@COFs的PI涂层相比,分别降低了35.3%和61.1%。COFs包覆GLM不仅可有效改善GLM与PI基体的相容性,还可有效发挥COFs与GLM协同减摩和耐磨的作用,在摩擦表面形成一层固-液复合自润滑转移膜,避免了基体和金属摩擦副之间的直接接触,进而有效降低了复合涂层的摩擦系数及体积磨损率。Solid-liquid composite lubricating microcapsules(GLM@COFs)were prepared by coating polyvinylpyrrolidone(PVP)modified Ga-based liquid metal(GLM)with covalent organic framework polymers(COFs),characterized by TEM,XRD and EDS,and then added into polyimide(PI)to obtain GLM@COFs/PI composite coatings.The effect of GLM@COFs content[on the basis of total mass of 4,4'-diaminodiphenyl ether(ODA),benzetetracarboxylic anhydride(BTDA)and GLM@COFs,the same below]on the tribological properties of GLM@COFs/PI composite coating was analyzed,while the wear mechanism of wear surface on the coating was explored by SEM and XPS.The results showed that GLM@COFs was spherical with an average particle size of about 2μm.GLM@COFs/PI composite coating with 0.9%content of GLM@COFs exhibited the best tribological properties,with the friction coefficient and volume wear rate of 0.22 and 6.3×10^(-6) mm^(3)/(N·m),respectively,reduced by 35.3%and 61.1%compared with those of the PI coating without [e-mail] coated GLM not only effectively improved the compatibility between GLM and PI matrix,but also achieved synergistic reduction in friction and wear resistance between COFs and GLM.A solid-liquid composite self-lubricating transfer film on the friction surface was fromed,thus avoiding direct contact between the matrix and the metal friction pair,and effectively reducing the friction coefficient and volume wear rate of the composite coating.

关 键 词：Ga基液态金属 共价有机框架聚合物 聚酰亚胺涂层 摩擦学 功能材料 

分 类 号：O635.2[理学—高分子化学] TG174.4[理学—化学]