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Zhao G.,State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing100049 China | Ding Q.,State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing100049 China | Wang Q.,State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics
Polymer Composites | Year: 2015

In this study, friction and wear of polyimides reinforced by carbon, glass, aramid, and nano-alumina fibers were studied and comparatively evaluated against Si3N4 on a ball-on-disk test rig under dry rotating and reciprocating sliding, and coefficient of friction and wear rate were considered as responses. The worn surfaces of the composites were examined by scanning electron microscopy to reveal wear mechanisms of the materials' damage. Wear mechanisms are found to be dependent on the test conditions and mechanical properties of the composites itself. It was proven that different reinforcements had different effects on the friction and wear behavior of the polyimide composites to a great extent. The testing condition also had an important role on the tribological properties of the same materials. The best performance was shown by glass fiber-reinforced polyimide composites owing to their excellent strength and hardness which can share the applied load on the sliding surface. © 2015 Society of Plastics Engineers.


Wu Y.,Ningbo Institute of Materials Technology and Engineering | Zhou Y.,Ningbo Institute of Materials Technology and Engineering | Li J.,Ningbo Institute of Materials Technology and Engineering | Zhou H.,State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics | And 2 more authors.
Journal of Applied Polymer Science | Year: 2016

Development of structure-properties relationships between the fillers/rubber matrix interface chemistry and the dispersion and interfacial adhesion properties of the rubber composites is critical to predict their bulk mechanical and tribological properties. In this paper, three solution styrene butadiene rubber (SSBR) composites containing various fillers with tailored interfacial chemistry were prepared via conventional mixing technique. Subsequently, thermal and structural features of filled SSBR composites were monitored by TG, DSC, XRD, XPS, FESEM and TEM, respectively. Sliding contact experiments were conducted to study tribological properties of styrene butadiene rubber composites under dry and wet conditions. It was shown that the SSBR filled with silicon dioxide nanoparticles significantly reduced both the friction coefficient and the wear against marble block. On the contrary, it exhibited an increased friction coefficient and wear under wet friction conditions due to the specific superior wet-skid resistance of silicon dioxide nanopartilce filled rubber composites, a good dispersion of silicon dioxide nanopartilce in the rubber matrix and strong interfacial adhesion between nanoparticles and rubber matrix. In addition, the influence of fillers dispersion and interfacial adhesion on friction and wear of styrene butadiene rubber composites was evaluated employing theoretical calculation, and the predicted results were in agreement with the experimental observations. © 2016 Wiley Periodicals, Inc.


Chen B.,Institute for Advanced Materials | Yang J.,Institute for Advanced Materials | Wang J.,State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics | Liu N.,State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics | And 2 more authors.
Polymer Composites | Year: 2014

Fiber hybrid polyimide-based (PI-based) composites reinforced with carbon fiber (CF) and poly-p-phenylene benzobisthiazole (PBO) fiber of different volume fractions were fabricated by means of hot press molding technique, and their mechanical properties and tribological behaviors under sea water lubrication were systematically investigated in relation to the synergism of CF and PBO fiber. Results showed that the incorporation of CF or PBO fiber improved the tensile strength, hardness, and wear resistance of PI. More importantly, because of the synergistic enhancement effect between CF and PBO fiber on PI matrix, the combination of 10%CF and 5%PBO fiber reinforced PI-based composite had the best mechanical and tribological properties, showing promising application in ocean environment. © 2014 Society of Plastics Engineers.


Ye X.,Chinese Academy of SciencesLanzhou | Wang J.,State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics | Xu Y.,Chinese Academy of SciencesLanzhou | Niu L.,Chinese Academy of SciencesLanzhou | And 6 more authors.
Journal of Applied Polymer Science | Year: 2014

Series of polyimide (PI)/mesoporous silica nanospheres (MSNs) nanocomposite films with different contents of MSNs were successfully prepared via a simple wet impregnation method. The morphologies, microstructures, mechanical properties, transmittance, and thermal properties of the prepared PI and the PI/MSNs nanocomposite films were investigated in detail. As a result, the thermal stability and mechanical performances of PI were obviously improved by incorporating MSNs into PI. The tensile stress and Young's modulus of the nanocomposite film with 5 wt % MSNs were raised up to 97.65 MPa and 2220.06 MPa, which are greatly higher than the values of 82.51 MPa and 1440.86 MPa for the pure PI film. Experimental results confirmed that the designed polymerization tactic, which occurred in the pores of the MSNs, facilitated to enhance the mechanical and physical performances of the PI/MSNs nanocomposite films, and definitely induced better integration between organic matrix and inorganic nanofillers. © 2014 Wiley Periodicals, Inc.

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