Image icon  Conformation and crystallinity

 
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Description: This is a schematic image showing structure of the molecule of polytetrafluoroethylene (PTFE) with a helical conformation. It shows fluorine atoms present on all the carbon atoms, pack neatly together into the helix. The figure is based on a so-called space filling, so that the true atom sizes are taken into account. It is thought that this is one of the reasons for the exceptionally low coefficient of friction of PTFE μ ∼0.04), because fluorine has extremely weak van der Waals bonds with others around it, whether other fluorine atoms or foreign atoms at an interface.
Keywords: crystallinity • structure • polytetrafluoroethylene • PFTE • conformation • fluorine • friction coefficient • van der Waals bonds • image
Categories: Science approaches > Structure, bonding & defects > Crystal structure
Materials > Polymers & elastomers
Materials > Polymers & elastomers > Plastics
Materials > Polymers & elastomers > Plastics > Thermoplastics > Polytetrafluoroethylene (Teflon, PTFE)
Properties > Mechanical & thermal
Created by: C.W. Bann
The Open University
E. R. Howells
Published by: The Open University
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 09 March 1954
Date added: 15 December 2010
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Resource ID: 3296