不同分子结构聚酰亚胺固-液复合摩擦学行为与润滑机理研究  

Solid-Liquid Duplex Lubrication Behavior and Mechanism of Polyimide with Different Molecular Structure

作　　者：李哲[1] 段春俭 高传平 张晟卯[1] 张平余[1] 王廷梅[2] 王齐华[2] LI Zhe;DUAN Chunjian;GAO Chuanping;ZHANG Shengmao;ZHANG Pingyu;WANG Tingmei;WANG Qihua(Engineering Research Center of Nanomaterials,Henan University,Henan Kaifeng 475004,China 2.State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)

机构地区：[1]河南大学纳米材料工程研究中心,河南开封475004 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2023年第4期397-409,共13页Tribology

基　　金：河南省自然科学基金项目(222300420124,212300410332);中原科技创新领军人才计划项目(214200510024)资助.

摘　　要：设计合成了一种新型热固性聚酰亚胺(TPI)材料,利用DMA242C型动态热机械分析仪、万能试验机以及接触角测量仪等对其机械性能、热学性能以及表面基础油PAO10的润湿性能进行表征,并与商业化的热塑性聚酰亚胺YS-20作对比,考察了两种不同分子结构的聚酰亚胺(PI)在PAO10润滑下的摩擦学行为.球-盘摩擦试验结果表明,无论是在模拟的多次“启-停”往复运动,还是模拟一次“启-停”的旋转接触运动,TPI与PAO10的固-液复合体系均具有优异的抗磨减摩性能,主要归因于TPI与PAO10之间较好的润湿性与物理吸附作用.通过分子动力学模拟的方法,进一步验证了空间化学交联TPI的空间化学交联结构增强了其表面与PAO10之间的物理吸附作用,有助于提高边界膜的构筑速度与承载能力,进而改善了两者复合体系的摩擦学行为.With outstanding properties such as excellent mechanical performance,good thermal stability and chemical resistance,polyimide(PI)plays a vital role in many high-tech applications such as air-engines,aerospace vehicles,microelectronics industry and precision machinery.For a long-life lubrication in harsh condition,the recent creative methods combined self-lubricating PI with different base oil have come into practical application,such as porous oilimpregnated cage and oil-containing coating.In this article,a new type of thermosetting polyimide(TPI)material was synthesized and its mechanical properties,thermal properties and wetting behavior of surface base oil(PAO10)were characterized based on the technique of dynamic mechanical analysis(DMA),universal testing machine and contact angle measuring instrument,respectively.The commercial PI(YS-20)was also explored in comparison as different molecular structures of TPI.It was clear that TPI with the special structure of chemical crosslinking poses a higher heat-resistance and poor mechanical performance.Besides,the analysis of contact angle indicated that both TPI and YS-20 had a better wettability on the surface.In addition,the tribological behavior of the two PI with PAO10 solid-liquid duplex system was investigated to focus on the effect of tribological behavior of different PI molecular structures with PAO10 and mechanism of synergistic effect was further verified theoretically.On this basis,two modes of friction with ball-disk contact were used in order to reflect the varies of application condition.The continuous rotating mode would basically represent with a single“start-stop”and intermittent reciprocating motions could be on behalf of multiple“start-stop”to some extent.Compared with dry friction conditions,both TPI and YS-20 under oil lubrication showed extremely low friction coefficient and wear rate,while the system of TPI and PAO10 was better than YS-20 with PAO10.These results showed that the solid-liquid duplex system of TPI and PAO10 had excellent

关 键 词：聚酰亚胺 分子结构 基础油 固-液复合润滑 摩擦学行为 

分 类 号：TH117.1[机械工程—机械设计及理论] TH117.2