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Friction 2024年第3期12卷 452-461页

作者： Xiaoyue wang Zenghui YANG tingmei wang Qihua wang Xinrui ZHANG Song LI Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Recyclability of thermosetting polymers and their composites is a challenge for alleviating environmental pollution and resource *** this study,solvent-recyclable thermosetting polyimide(PI)and its composite were successfully *** tensile strength,elongation at break,and Young’s modulus of PI are 108.70±7.29 MPa,19.35%±3.89%,and 2336.42±128.00 MPa,*** addition of reduced graphene oxide(RGO)not only enhances the mechanical properties of PI but also endows it with excellent tribological *** PI illustrates a high recycling efficiency of 94.15%,but the recycled composite exhibits inferior mechanical *** recycling and utilization of PI and its composite are realized through imine bonds(-C=N),which provides new guidance for solving the problem of environmental pollution and resource waste and is potential application in the field of sustainable tribology.

关键词： thermosetting polyimide(PI) recyclability dynamic covalent bonds friction and wear polymer composites

Tribological properties of PTFE-based fabric composites at cryogenic temperature

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Friction 2024年第2期12卷 245-257页

作者： Mingkun XU Zidan wang Lihe GUO Liming TAO Tianbao MA tingmei wang Qihua wang Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Fabric composites are widely employed in self-lubricating bearing liners as solid lubrication *** the tribological behaviors of fabric composites have been extensively studied,the cryogenic tribological properties and mechanisms have been scarcely reported and are largely unclear to instruct material design for aerospace and other high-tech ***,the tribological properties of polytetrafluoroethylene(PTFE)-based hybrid-fabric composites were investigated at cryogenic and ambient temperatures in the form of pin-on-disk friction under heavy *** results suggest that the friction coefficients of the hybrid-fabric composites obviously increase with a decrease in wear when the temperature drops from 25 to−150°***,thermoplastic polyetherimide(PEI),as an adhesive for fabric composites,has better cryogenic lubrication performance than thermosetting phenol formaldehyde(PF)resin,which can be attributed to the flexible chemical structure of *** excellent lubrication performance of hybrid-fabric composites is attributed to the transfer film formed by PTFE fibers on the surface of fabrics.

关键词： cryogenic temperatures fabric composites friction and wear transfer film

聚六氢化三嗪交联聚酰亚胺/石墨烯形状记忆复合材料

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功能高分子学报 2024年第2期37卷 113-120页

作者：杨增辉王炎张新瑞王廷梅王齐华中国科学院兰州化学物理研究所兰州730000

以高分散性的氧化石墨烯(GO)作为增强相,通过溶剂挥发、高温环化的方法制备了聚六氢化三嗪交联聚酰亚胺/石墨烯(PI-PHT)形状记忆复合材料。利用核磁、红外光谱、热重分析等对材料的结构和热稳定性进行表征,通过万能试验机对复合材料的... 详细信息

以高分散性的氧化石墨烯(GO)作为增强相,通过溶剂挥发、高温环化的方法制备了聚六氢化三嗪交联聚酰亚胺/石墨烯(PI-PHT)形状记忆复合材料。利用核磁、红外光谱、热重分析等对材料的结构和热稳定性进行表征,通过万能试验机对复合材料的力学性能进行测试,通过动态热机械分析仪对热机械性能、形状记忆性能、形状回复力等进行分析。结果表明:引入石墨烯后,复合材料的强度、韧性、热机械性能以及形状记忆性能明显提升,其中当GO的质量分数为5%时,复合材料的拉伸强度和韧性分别达到105.7 MPa和12.4 MJ/m~3(相比未添加GO的PI-PHT分别提高了1.3倍和2倍),并且其形状固定率、回复率和回复应力分别达到了97.2%、92.6%和9.46 MPa。

关键词：聚酰亚胺形状记忆石墨烯聚六氢化三嗪力学性能

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Efficacy of hierarchical pore structure in enhancing the tribological and recyclable smart lubrication performance of porous polyimide

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Friction 2023年第6期11卷 1014-1026页

作者： Hongwei RUAN Yaoming ZHANG Fuzhi SONG Qihua wang Chao wang tingmei wang Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Herein,a porous oil-containing material with hierarchical pore structure was successfully prepared through microtexturing large pores on the surface of porous polyimide(PPI)with single-level small *** to the conventional oil-containing material,the hierarchically porous oil-containing material exhibited high oil-content,and retained excellent mechanical properties and high oil-retention because of the synergistic effects of large pores and small ***,the lubricant stored in the hierarchically porous polyimide could release to the interface under thermal-and-mechano-stimuli,and the released lubricant could be reabsorbed into the hierarchically porous polyimide via the capillary-force offered by the porous *** on the high oil-content and recyclable oil release/reabsorption,the hierarchically porous oil-containing polyimide exhibited excellent lubrication performance(coefficient of friction was 0.057).Furthermore,the composite could perform 1,069 cycles of smart lubrication(1 h per cycle),which significantly extended the service life of the hierarchically porous oil-containing smart lubrication material.

关键词： recyclable smart lubrication hierarchical pore structure oil-content and oil-retention friction and wear

玉米烯酮与氟苯尼考对雏鸡免疫功能和生长性能的影响

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家畜生态学报 2024年第7期45卷 21-27页

作者：杨昱暄王廷梅吕世明王忠刘宝生王旺胡梦鑫王立琦贵州大学动物科学学院高原山地动物遗传育种与繁殖教育部重点实验室贵州贵阳550025 纳雍县农业农村局生态畜牧发展中心贵州毕节551700 江西农业大学动物科学技术学院江西南昌330045

玉米烯酮(zearalenone,ZEN)为常见的环境污染物,而氟苯尼考(florfenicol,FFC)则是兽医临床上应用非常广泛的抗菌药,二者极有可能同时暴露,对动物产生毒副作用,但目前尚未见相关研究报道。为探究ZEN和FFC单独与共同暴露对雏鸡生长性能和... 详细信息

玉米烯酮(zearalenone,ZEN)为常见的环境污染物,而氟苯尼考(florfenicol,FFC)则是兽医临床上应用非常广泛的抗菌药,二者极有可能同时暴露,对动物产生毒副作用,但目前尚未见相关研究报道。为探究ZEN和FFC单独与共同暴露对雏鸡生长性能和免疫功能的影响,将40只1日龄雏鸡适应性饲养2 d,于3日龄时随机分为4组,每组10只,公母各半,分别为对照组、ZEN组(按1 mg·kg^(-1)日粮剂量染毒ZEN 21 d)、FFC组(按100 mg·L^(-1)饮水给药FFC,连续5 d)和ZEN+FFC组(按1 mg·kg^(-1)日粮连续染毒ZEN 21 d的同时,前5 d连续按治疗剂量100 mg·L^(-1)饮水给药FFC),试验周期为21 d。测定雏鸡的平均日增重、脏器指数和料重比,并采用ELISA试剂盒检测血清中细胞因子和新城疫抗体水平。结果表明,即使是低水平的ZEN也可抑制白细胞介素-2(IL-2)和干扰素-γ(IFN-γ)的分泌从而抑制雏鸡免疫功能,并可能通过促进白细胞介素-1(IL-1)、白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)的释放诱发炎症反应;早期使用治疗剂量的FFC不仅可抑制雏鸡的生长,还能使IL-2和IFN-γ分泌下调从而产生免疫抑制。二者共同暴露虽然可减轻其对IL-2和IFN-γ的抑制作用,并控制玉米烯酮诱导的炎症反应,但可抑制雏鸡的体液免疫应答水平。因此,应加强雏鸡饲料中ZEN污染的监控,慎重使用FFC作为开口药,尽量避免在二者同时存在时对雏鸡进行疫苗接种,以防免疫失败。

关键词：玉米烯酮氟苯尼考鸡细胞因子生长性能

Shape-controlled Synthesis of Porous SnO_2 Nanostructures via Morphologically Conserved Transformation from SnC_2O_4 Precursor Approach

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Nano-Micro Letters 2011年第1期3卷 34-42页

作者： Qihua wang Dewei wang tingmei wang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences

Porous SnO_2 nanostructures with controlled shapes were synthesized by a facile morphologically conserved transformation from Sn C_2O_4 precursor approach. Well-defined Sn C_2O_4 nanostructures can be obtained through a solution-based precipitation process at ambient conditions without any surfactant. The formation mechanism of such microstructures was tentatively proposed on the basis of intrinsic crystal structure and the reaction conditions. We found that the morphologies of precursor were well maintained while numerous pores were formed during the annealing process. The combined techniques of X-ray diffraction, nitrogen absorption–desorption, field emission scanning electron microscopy, and(high-resolution) transmission electron microscopy were used to characterize the as-prepared SnO_2 products. Moreover, cyclic voltammetry(CV) study shows that the shape of CV presents a current response like roughly rectangular mirror images with respect to the zero-current line without obvious redox peaks, which indicating an ideal capacitive behavior of the SnO_2 electrodes. The photoluminescence(PL) spectrum study suggests that the as-obtained porous SnO_2 nanostructures might have a large number of defects, vacancies of oxygen, and local lattice disorder at the interface, interior and exterior surfaces.

关键词： Shape-controlled SnO2 Solution chemistry

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盾构机主驱动单唇形密封圈密封性能研究

润滑与密封 2024年第7期49卷 89-95,167页

作者：何波李珍莲何文豪鲁志斌王廷梅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 中国航发湖南动力机械研究所湖南株洲412002 中国科学院兰州化学物理研究所中国科学院材料磨损与防护重点实验室甘肃兰州730000

以典型工况下盾构机主驱动单唇形密封圈为研究对象,利用单轴拉伸试验得到密封圈丁腈橡胶材料的应力-应变曲线,确定Yeoh三阶模型的材料参数;建立单唇形密封圈的二维轴对称有限元模型,研究介质压力、压差、摩擦因数和温度对其密封性能的... 详细信息

以典型工况下盾构机主驱动单唇形密封圈为研究对象,利用单轴拉伸试验得到密封圈丁腈橡胶材料的应力-应变曲线,确定Yeoh三阶模型的材料参数;建立单唇形密封圈的二维轴对称有限元模型,研究介质压力、压差、摩擦因数和温度对其密封性能的影响规律。研究表明:介质压力主要影响最大接触应力,随着介质压力的增加,最大接触应力呈线性增加;介质压差主要影响最大接触应力和接触长度,随着介质压差的增加,最大接触应力先线性增加然后基本保持不变,而接触长度呈非线性增加;温度变化对密封性能的影响可以忽略;在考虑的工况条件下,单唇形密封圈唇口与旋转轴接触处产生的最大接触应力始终大于介质压力,密封性能良好。

关键词：盾构机主驱动密封单唇形密封丁腈橡胶密封性能

Self-lubrication of tribologically-induced oxidation during dry reciprocating sliding of aged Ti–Ni51.5 at% alloy

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Friction 2021年第5期9卷 1038-1049页

作者： Rui YANG Wei MA Chunjian DUAN Song LI tingmei wang Qihua wang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The tribological behaviors of Ti–Ni51.5 at%alloy strengthened by finely dispersed Ni_(4)Ti_(3) particles in reciprocating sliding against GCr15,Al_(2)O_(3),and ZrO_(2) at room temperature were ***,the coefficient of friction(COF)suffered a sheer drop(from 0.9 to 0.2)when the aged alloy slid against GCr15 at a frequency of 20 Hz under a 20 N load without ***,severe‐mild wear transition disappeared when a solutionized alloy was ***,the COF stabilized at a relatively high level when Al_(2)O_(3) and ZrO_(2) were used as counterparts,although their wear mechanisms showed signs of *** electron microscopy(SEM)and X‐ray element mappings of the wear scars of the counterparts clearly indicate that the formation of well‐distributed tribo‐layer and material transfer between the ball and disk are pivotal to the severe‐to‐mild wear transition in the aged Ti–Ni51.5 at%alloy/GCr15 friction *** higher microhardness and superelasticity of the aged alloy significantly accelerate the material transfer from GCr15 to the disk,forming a glazed protective tribo‐layer containing Fe‐rich oxides.

关键词： self‐lubrication tribologically‐induced oxidation Ti–Ni51.5 at%alloy dry reciprocating sliding counterparts

Electrochemical capacity fading of polyaniline electrode in supercapacitor:An XPS analysis

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Progress in Natural Science:Materials International 2017年第2期27卷 257-260页

作者： Jinxing Deng tingmei wang Jinshan Guo Peng Liu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou University State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences

To understand the electrochemical capacity fading of the polyaniline（PANI） electrodes in supercapacitors, for the first time, their chemical structure change during electrochemical cycles was traced with XPS analysis after the HCl doped PANI electrodes were subjected to the cyclic voltammetry test in 1.0 M H;SO;electrolyte for different cycle numbers. The results showed that the chlorine disappeared in the electrode surface, while the surface element contents of sulfur and oxygen increased with the electrochemical cycles increased. It demonstrated that the hydrolytic degradation of the PANI chains and exchange of dopant occurred during the electrochemical cycling, causing the fading in the mechanical and electrochemical performance of the PANI electrodes. This understanding should lead to better design of the conductive polymer-based energy storage devices.

关键词： Polyaniline Electrochemical properties Fading XPS analysis

The effect of different layered materials on the tribological properties of PTFE composites

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Friction 2020年第3期8卷 542-552页

作者： Song LI Chunjian DUAN Xiao LI Mingchao SHAO Chunhui QU Di ZHANG Qihua wang tingmei wang Xinrui ZHANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy ofSciences Beijing 100049China

Two-dimensional(2D)lamellar materials have unique molecular structures and mechanical properties,among which molybdenum disulfide(MoS2)and graphitic carbon nitride(g-C3N4)with different interaction forces served as reinforcing phase for polytetrafluoroethylene(PTFE)composites in the present *** stability,tribological and thermomechanical properties of composites were comprehensively *** was demonstrated that g-C3N4 improved elastic deformation resistance and thermal degradation *** addition of g-C3N4 significantly enhanced anti-wear performance under different loads and *** results indicated that PTFE composites reinforced by g-C3N4 were provided with better properties because the bonding strength of g-C3N4 derived from hydrogen bonds(H-bonds)was stronger than that of MoS2 with van der Waals ***,g-C3N4 exhibited better thermomechanical and tribological *** result of this work is expected to provide a new kind of functional filler for enhancing the tribological properties of polymer composites.

关键词： graphitic carbon nitride lamellar materials hydrogen bonds wear resistance