wtc2005_63881 - Proceedings of WTC2005 World Tribology...

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1 Copyright © 2005 by ASME Proceedings of WTC2005 World Tribology Congress III September 12-16, 2005, Washington, D.C., USA WTC2005-63881 NANO-TRIBOLOGY OF A POLYTETRAFLUOROETHYLENE TRANSFER FILMS USING MOLECULAR DYNAMICS SIMULATION AND MICROTRIBOMETRY Inkook Jang*, Pamela L. Dickrell**, David L. Burris**, W. Gregory Sawyer**, Simon R. Phillpot* and Susan B. Sinnott* *Department of Materials Science and Engineering **Department of Mechanical and Aerospace Engineering University of Florida, Gainesville, FL ABSTRACT Polytetrafluoroethylene (PTFE) is a well known solid lubricant and polymer nanocomposites based on PTFE are considered to be promising materials for tribological applications in space. Like other polymer materials, many properties of PTFE depend on morphology. In this study, molecular dynamics (MD) simulations are performed to examine the effect of chain configuration on the frictional behavior of PTFE at the molecular level and compared to microtribological studies on aligned transfer films of PTFE. INTRODUCTION Mechanical devices for space applications need to be able to operate reliably in an extreme range of environments. They are produced and tested on earth, launched, and then operated in space. The reliability of the moving mechanical assemblies is one of the most critical issues in attempting to prolong service life. These components experience an extreme environmental range, and nanostructured polymer composite materials are candidate materials for improved performance. In particular, PTFE either as filler or a matrix is being explored. The C-F bond in PTFE provides both thermal and oxidative stability, and the strong interchain interactions in PTFE confer resistance to almost all solvents [1]. The intrinsically poor wear resistance of PTFE is improved by incorporation with nanoscopic fillers. For example, Sawyer et al. created a nanocomposite of PTFE with alumina that has a reduction in wear rate of over 2 orders of magnitude compared with unfilled PTFE [2]. In these nanocomposite systems PTFE transfer films
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wtc2005_63881 - Proceedings of WTC2005 World Tribology...

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