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Li S.,Yunnan University of Finance and Economics | Di Y.,Yunnan University of Finance and Economics | Di Y.,Kunming University of Science and Technology | Liang X.,Shanghai Zhuzong Company
International Journal of Polymeric Materials and Polymeric Biomaterials | Year: 2013

The tribological behavior of PA66, PA66/Montmorillonite nanocomposites, and PA66/(SEBS-g-MA + Montmorillonite) nanocomposites was studied by means of a ring-on-block tribometer. The morphologies of the worn surfaces of specimens were observed with scanning electron microscopy (SEM). Wear of all of the specimens increases with increasing load; meanwhile, the friction coefficient decreases. Wear of PA66/Montmorillonite is larger than that of PA66. Adding SEBS-g-MA to PA66/Montmorillonite improves the wear resistance. The friction coefficient of PA66/Montmorillonite is slightly less than that of PA66 at various loads. The friction coefficient of PA66/(SEBS-g-MA + Montmorillonite) is the lowest. © 2013 Copyright Taylor and Francis Group, LLC.

Tang G.,Shanghai Maritime University | Chang D.,Shanghai Maritime University | Wei G.,China Institute of Medical Equipment | Lu H.,Shanghai Maritime University | And 2 more authors.
Polymer - Plastics Technology and Engineering | Year: 2012

PA66 composites filled with surface-treated carbon fiber were prepared by twin-screw extruder in order to study the influence of carbon fiber surface arylboronic acid treatment on the mechanical and tribological behavior of the PA66 composites (CF/PA66). The mechanical property, friction and wear tests of the composites with untreated and treated carbon fiber were performed and the worn surface morphology was analyzed. The results show that the worn surface area of the treated carbon fiber was far smoother than that of the untreated carbon fiber and there formed a bonding adhesion on the carbon fiber surface after treatment. The tensile strength of CF/PA66 composites with surface arylboronic acid treatment was improved. The friction coefficient and wear of arylboronic acid treated CF/PA66 composites were apparently lower than that with untreated carbon fiber. In conclusion, the surface treatment favored the improvement of the higher interface strength and so had good effect on improving the tribological properties of the composites. © 2012 Copyright Taylor and Francis Group, LLC.

Li J.,Shanghai Second Polytechnic University | Sheng X.H.,Shanghai Zhuzong Company
Materials Technology | Year: 2010

Thin films deposited on the phosphonate 3-aminopropyltriethoxysilane (APTES) self-assembled monolayer (SAM) were prepared on the hydroxylated silicon substrate by a self-assembling process from specially formulated solution. Chemical compositions of the films and chemical state of the elements were detected by X-ray photoelectron spectrometry. The thickness of the films was determined with an ellipsometer, while the morphologies and nanotribological properties of the samples were analysed by means of atomic force microscopy. As the results, the target film was obtained and reaction may have taken place between the thin films and the silicon substrate. It was also found that the thin films showed the lowest friction and adhesion followed by APTES-SAM and phosphorylated APTES-SAM, while silicon substrate showed high friction and adhesion. © 2010 W. S. Maney & Son Ltd.

Nie W.Z.,Shanghai Institute of Technology | Li J.,Shanghai Second Polytechnic University | Sheng X.H.,Shanghai Zhuzong Company
Materials Science- Poland | Year: 2010

The ozone modification method and air-oxidation were used for the surface treatment of polyacrylonitrile- based carbon fibre. The interfacial properties of carbon fibre-reinforced polyamide 6 (CF/PA6) composites were investigated by means of single fibre pull-out tests. It was found that the IFSS values of the composites with ozone treated carbon fibre are increased by 60% compared with that without treatment. The effect of surface treatment of carbon fibres on the tribological properties of CF/PA6 composites was also investigated for comparison. Experimental results revealed that surface treatment can effectively improve the interfacial adhesion between carbon fibre and PA6 matrix. Thus the wear resistance was significantly improved.

Li J.,Shanghai Second Polytechnic University | Sheng X.H.,Shanghai Zhuzong Company
Journal of Materials Engineering and Performance | Year: 2010

Polytetrafluoroethylene (PTFE)/PA6 blends of different compositions, where PTFE acts as the polymer matrix and PA6 as the dispersed phase, were produced in a corotating twin-screw extruder. The effects of PA6 content on mechanical and tribological properties of the composites were investigated. The worn surface morphologies of neat PTFE and its composites were examined by scanning electron microscopy (SEM) and the wear mechanisms were discussed. The presence of PA6 particles dispersed in the PTFE continuous phase exhibited superior tribological characteristics to unfilled PTFE. The optimum value of wear reduction was obtained when the content of PA6 is 30 vol.%. © ASM International.

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