Investigation on the Tribological Properties of POM Modified by Nano-PTFE |
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| Authors: | Ting Huang Renguo Lu Hongyan Wang Yuning Ma Jianshu Tian Tongsheng Li |
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| Affiliation: | Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science , Fudan University , Shanghai , China |
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| Abstract: | The tribological properties of polyoxymethylene (POM) modified by nano-polytetrafluorethylene (nano-PTFE) were investigated by a block-on-ring wear tester. For comparison, modified POM with micro-polytetrafluoroethylene (micro-PTFE) was also studied. The modified POM with a much lower concentration of nano-PTFE showed the similar tribological properties compared with POM modified by micro-PTFE. The friction coefficient decreased with the increase of nano-PTFE, while the wear rate showed the lowest value when the concentration of nano-PTFE was 2%. Scanning electron microscope (SEM) micrographs revealed that transfer films played an important role in the friction process. The transfer films decreased and stabilized the friction coefficient. Comparing to POM/2%nano-PTFE, when the concentration of nano-PTFE reached 4%, the mechanical properties decreased significantly, possibly due to poor dispersion of nano-PTFE. |
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| Keywords: | nano-PTFE polyoxymethylene solution treatment surface topography tribological properties |
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