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采用水热方法,选用5-(2-羧基苯基)吡啶-3-甲酸配体(H2cpna)与1,2-二(4-吡啶基)乙烷(dpea)或1,2-二(4-吡啶基)乙烯(dpey)分别与NiCl2·6H2O和ZnCl2在160℃下反应,合成了2个三维配位聚合物{[Ni(μ3-cpna)(μ-dpea)0.5]·H2O}n (1)和{[Zn(μ3-cpna)(μ-dpey)0.5]·H2O}n (2),并对其结构、催化和摩擦性质进行了研究。研究表明,在室温条件下化合物2在Knoevenagel缩合反应中显示出较好的催化活性。同时,2在聚α-烯烃合成润滑剂中显示出有效的抗磨性能。 相似文献
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往复摩擦下热压镍-二硫化钼复合材料的自润滑性能及其耐磨机理研究 总被引:1,自引:0,他引:1
对于含MoS2的复合材料在单向滑动摩擦条件下的实用性能,人们已经进行了比较多的研究,然而好多摩擦部件在工程实际中经受的却都是往复摩擦。为了探明热压Ni-MoS2复合材料的自润滑性能及其耐磨机理,在往复摩擦条件下研究了这种材料盘表面和偶件GCr15钢球表面之MoS2膜的形成过程与形貌特征,并且利用扫描电子显微镜等观察分析了MOS2膜的磨损表面形貌及其微区成分。结果表明,在给定的往复摩擦条件下,对偶双方表面都形成了具有层状结构的MoS2润滑膜,这种膜是通过疲劳剥落、转移、粘附与叠压等方式所形成;MoS2含量对Ni-MoS2复合材料自润滑性能的影响,主要取决于它是否能够在对偶双方表面形成分布均匀而稳定的润滑膜,含60%(wt)MoS2的复合材料的自润滑性能最好;Ni-MoS2复合材料的自润滑性是通过其表面MoS2膜的连续生成与疲劳剥落,并在偶件表面形成转移膜,使复合材料与金属间的摩擦变成复合材料表面MoS2膜与偶件表面MoS2膜之间的摩擦所实现。由此可见,Ni-MOS2复合材料是适合在往复摩擦运动场合应用的一种性能良好的自润滑复合材料。 相似文献
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Chufeng Sun Ming Zhang Feng Zhou Ping Gao Yanqiu Xia Weimin Liu 《Journal of Macromolecular Science: Physics》2013,52(5):1006-1017
Multiply-alkylated cyclopentanes (MACs) composite thin films containing Cu nanoparticles are fabricated on the octadecyltrichlorosilane (OTS)-modified substrate by a spin-coating technique. The thickness, wetting behavior, and nanoscale morphologies of the films are characterized by means of ellipsometry, contact angle measurement, and atomic force microscope (AFM). The friction and wear behaviors of the thin films sliding against Si3N4 ball are examined on a UMT-2MT tribometer in a ball-on-disk contact mode. The worn surfaces of the OTS-MAC-Cu composite film and the counterpart Si3N4 balls are investigated with a scanning electron microscope. Water contact angle on OTS-MAC-Cu composite film is higher than that of OTS-MAC film. OTS-MAC-Cu composite film exhibits higher load-carrying capacity and better friction reduction and antiwear behavior as compared with OTS-MAC film. This may be attributed to the load-carrying and self-repairing property of the Cu nanoparticles in the composite film and the formation of a transfer layer composed of OTS, MAC, and Cu on the rubbing surface of the counterpart ball. 相似文献
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硫化橡胶因其良好的力学和物理化学性能而被广泛作为摩擦副的基础材料. 本文提出了一种硫化交联算法, 实现了C—C键的硫化互交联和自交联, 构建了硫化丁苯橡胶的分子动力学磨损模型, 从微观摩擦学的角度阐明了硫化交联结构对改善丁苯橡胶磨损性能的机理, 研究了不同界面参数对硫化橡胶微观磨损性能的影响. 结果发现 硫化使丁苯橡胶分子链的界面黏附能力和活动能力更弱, 拉伸和解缠能力更低, 磨损过程中界面累积能量更低, 更不容易脱离橡胶基体, 因此可以表现出更好的摩擦学性能, 更强的抗磨损性能; 随着速度的增大, 硫化橡胶的磨损率降低, 与宏观实验结果一致, 原因是硫化橡胶的原子分布函数和相互作用能随着速度增大而降低, 说明橡胶分子链的黏附能力和活动能力随着速度增加趋弱, 温升更低, 导致较低的磨损率; 压入深度对磨损率的影响规律则呈现相反的结果和趋势. 相似文献
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Norbert MISKOLCZI Richard Sá GI Lá szló BARTHA Lí via FORCEK 《燃料化学学报》2009,37(3):302-310
A new route of utilization of α-olefin rich hydrocarbon fractions obtained by waste polymer pyrolysis was investigated. α-olefin-succinic-anhydride intermediate-based pour point depressant additives for diesel fuel were synthesized, in which reactions needed α-olefins were obtained by pyrolysis of waste high-density polyethylene (HDPE). Fraction of α-olefins was produced by the de-polymerization of plastic waste in a tube reactor at 500℃ in the absence of catalysts and air. C17~22 range of mixtures of olefins and paraffins were separated for synthesis and then, these hydrocarbons were reacted with maleic-anhydride (MA) for formation of α-olefin-succinic-anhydride intermediates. The olefin-rich hydrocarbon fraction contained approximately 60% of olefins, including 90%~95% α-olefins. Other intermediates were produced in the same way by using commercial C20 α-olefin instead of C17~22 olefin mixture. The two different experimental intermediates with number average molecular weights of 1850g/mol and 1760g/mol were reacted with different alcohols: 1-butanol, 1-hexanol, 1-octanol, i-butanol, and c-hexanol to produce their ester derivatives. The synthesized ten experimental pour point depressants were added in different concentrations to conventional diesel fuel, which had no other additive content before. The structure and efficiency of experimental additives were followed by different standardized and non-standardized methods. Results showed that the experimental additives on the basis of the product of waste pyrolysis were able to decrease not only the pour but also the cloud point and cold filter plugging point (CFPP) of diesel fuel, whose effects could be observed even if the concentration of additives was low. Furthermore, all additives had anti-wear and anti-friction effects in diesel fuel. 相似文献
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含氮硼酸衍生物的摩擦学性能及与二烷基二硫代磷酸锌(ZDDP)配伍性能研究 总被引:1,自引:0,他引:1
合成两种含氮硼酸衍生物抗磨添加剂:长链烷基醇胺硼酸钙ODOB-Ca、长链烷基醇胺和长链烷基苯酚的硼酸酯DPOB,分别用元素分析和红外光谱对分子结构进行表征.用热重分析仪考察两种化合物的热稳定性,用饱和蒸汽法考察其水解稳定性,发现这两种化合物均具有良好的热稳定性和较好的水解稳定性,其水解稳定性分别为硼化聚异丁烯基丁二酰亚胺(T154B)的3倍和10倍;用立式万能摩擦磨损试验机考察了ODOB-Ca和DPOB的摩擦学性能以及与ZDDP的配伍性能,结果表明两种化合物作为矿物基础油均具有较好的抗磨性能,且均与ZDDP在一定比例配伍,有很好的协同作用.采用XPS考察了钢球磨斑表面成份,结果显示钢球磨斑表面形成了B2O3、铁的氧化物以及硫酸化合物等多组分混合边界润滑膜,从而使配伍体系摩擦学性能得以改善. 相似文献
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合成了两种膦酸酯类离子液体,用作三羟甲基丙烷(TMP)与油酸(OA)的酯化催化剂合成三羟甲基丙烷三油酸酯(TMPTO).结果表明:这两种离子液体均具有一定的催化活性和较高的产物(二酯和三酯)选择性.反应结束后,离子液体催化剂可完全溶于产物TMPTO中,在微动摩擦磨损试验机SRV-IV上评价其作为钢/钢摩擦副润滑油减摩抗磨添加剂的高温摩擦学性能;结果表明所合成的磷酸酯离子液体具有优异的减摩抗磨性能.采用扫描电子显微镜(SEM)及X射线光电子能谱仪(XPS)对磨斑表面进行了分析,结果表明所合成的膦酸酯类离子液体在高温下均表现出优异的摩擦学性能,源于膦酸酯类离子液体与金属基底发生了摩擦化学反应并形成了摩擦化学反应膜从而使该离子液体表现出优异的摩擦学性能. 相似文献
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采用水热方法,选用5-(2-羧基苯基)吡啶-3-甲酸配体(H2cpna)与1,2-二(4-吡啶基)乙烷(dpea)或1,2-二(4-吡啶基)乙烯(dpey)分别与NiCl2·6H2O和ZnCl2在160℃下反应,合成了2个三维配位聚合物{[Ni (μ3-cpna)(μ-dpea)0.5]·H2O}n(1)和{[Zn (μ3-cpna)(μ-dpey)0.5]·H2O}n(2),并对其结构、催化和摩擦性质进行了研究。研究表明,在室温条件下化合物2在Knoevenagel缩合反应中显示出较好的催化活性。同时,2在聚α-烯烃合成润滑剂中显示出有效的抗磨性能。 相似文献