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Oil-soluble polymer brushes-functionalized nanoMOFs for highly efficient friction and wear reduction

Friction 2024年第7期12卷 1499-1511页

作者： Jianxi LIU Yong QIAN Dongsheng LI Wei WU Mengchen ZHANG Jie YAN Bin LI Feng ZHOU State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Shaanxi Engineering Research Center of Special Sealing Technology Xi'an Aerospace Propulsion InstituteXi'an 710100China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Nanomaterials as lubricating oil additives have attracted significant attention because of their designable composition and structure,suitable mechanical property,and tunable surface ***,the poor compatibility between nanomaterials and base oil limits their further *** this work,we demonstrated oil-soluble poly(lauryl methacrylate)(PLMA)brushes-grafted metal-organic frameworks nanoparticles(nanoMOFs)as lubricating oil additives that can achieve efficient friction reduction and anti-wear *** were synthesized by free-radical polymerization,which was coordinatively grafted onto the surface of the UiO-67 ***,PLMA brushes were grown on the macroinitiator-modified UiO-67 by surface-initiated atom transfer radical polymerization,which greatly improved the lipophilic property of the UiO-67 nanoparticles and significantly enhanced the colloidal stability and long-term dispersity in both non-polar solvent and base *** adding UiO-67@PLMA nanoparticles into the 500 SN base oil,coefficient of friction and wear volume reductions of 45.3%and 75.5%were achieved due to their excellent mechanical properties and oil ***,the load-carrying capacity of 500 SN was greatly increased from 100 to 500 N by the UiO-67@PLMA additives,and their excellent tribological performance was demonstrated even at a high friction frequency of 65 Hz and high temperature of 120℃.Our work highlights oil-soluble polymer brushes-functionalized nanoMOFs for highly efficient lubricating additives.

关键词： MOFs polymer brushes surface modification tribological properties friction reduction anti-wear

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On the friction and adhesion hysteresis between polymer brushes attached to curved surfaces: Rate and solvation effects

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Friction 2015年第2期3卷 148-160页

作者： Sissi de BEER G.DjuidjéKENMOÉ Martin H.MÜSER Materials Science and Technology of polymers MESA+Institute for NanotechnologyUniversity of TwenteP.O.Box 2177500 AE Enschedethe Netherlands Jülich Supercomputing Centre Institute for Advanced Simulation FZ Jülich 52425 JülichGermany Department of Physics Laboratory of Mechanics Faculty of ScienceUniversity of YaoundéP.O.Box 812YaoundéCameroon

Computer simulations of friction between polymer brushes are usually simplified compared to real systems in terms of solvents and *** most simulations,the solvent is only implicit with infinite compressibility and zero *** addition,the model geometries are parallel walls rather than curved or rough as in *** this work,we study the effects of these approximations and more generally the relevance of solvation on dissipation in polymer-brush systems by comparing simulations based on different solvation *** find that the rate dependence of the energy loss during the collision of brush-bearing asperities can be different for explicit and implicit ***,the non-Newtonian rate dependences differ noticeably between normal and transverse motion,i.e.,between head-on and off-center asperity ***,when the two opposing brushes are made immiscible,the friction is dramatically reduced compared to an undersaturated miscible polymer-brush system,irrespective of the sliding direction.

关键词： polymer brushes biomimetic materials molecular dynamics simulation

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Hydration lubrication

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Friction 2013年第1期1卷 1-23页

作者： Jacob KLEIN Department of Materials&Interfaces Weizmann Institute of ScienceRehovot76100Israel

The hydration lubrication paradigm,whereby hydration layers are both strongly held by the charges they surround,and so can support large pressures without being squeezed out,and at the same time remain very rapidly relaxing and so have a fluid response to shear,provides a framework for understanding,controlling,and designing very efficient boundary lubrication systems in aqueous and biological *** review discusses the properties of confined water,which-unlike organic solvents-retains its fluidity down to molecularly thin *** then describes lubrication by hydrated ions trapped between charged surfaces,and by other hydrated boundary species including charged and zwitterionic polymer brushes,surfactant monolayers,liposomes,and biological macromolecules implicated in synovial joint ***,challenges and prospects for future development of this new boundary lubrication approach are considered.

关键词： hydration lubrication biolubrication boundary lubrication liposomes polymer brushes hydration repulsion hydration layers

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基于微接触的超分子自组装光活性表面构建图案化高分子刷

基于微接触的超分子自组装光活性表面构建图案化高分子刷

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2014年全国高分子材料科学与工程研讨会

作者：肖鹏谷金翠刑汝博韩艳春陈涛中国科学院宁波材料技术与工程研究所高分子事业部中国科学院长春应用化学研究所高分子物理与化学国家重点实验室

图案化刺激响应型高分子刷在化学与生物传感器等表面基技术领域具有广泛的应用。在众多构筑图案化的方法中,软蚀刻技术(特别是微接触印刷,microcontact printing,μCP)以其操作简单,无需复杂昂贵设备等而备受亲睐。我们这里开发新的基... 详细信息

图案化刺激响应型高分子刷在化学与生物传感器等表面基技术领域具有广泛的应用。在众多构筑图案化的方法中,软蚀刻技术(特别是微接触印刷,microcontact printing,μCP)以其操作简单,无需复杂昂贵设备等而备受亲睐。我们这里开发新的基于微接触印刷诱导的作用方式,实现从小分子的芘甲氨、大分子以及微米尺度的氧化石墨烯纳米片等一系列单元在羟基化的硅基底形成超分子自组装的光活性表面,通过进一步的自引发紫外光接枝光聚合

关键词： polymer brushes micro-contact printing supramolecular self-assemble self-initiated photografting and photopolymerization

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