Molecular rheology of perfluoropolyether lubricant via nonequilibrium molecular dynamics simulation

Title
Molecular rheology of perfluoropolyether lubricant via nonequilibrium molecular dynamics simulation
Authors
Choi, H.J.
Keywords
molecular dynamics (MD) simulation, perfluoropolyether, relaxation time spectrum, viscoelasticity
Issue Date
2007-02
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract
Rheological properties of perfluoropolyether (PFPE) systems can be particularly important in designing effective lubricants that control the friction and wear in their tribological applications. Using equilibrium/nonequilibrium molecular dynamics (MD) simulation, we examined the rheological properties of PFPE lubricant, such as viscosity and viscoelastic properties, by observing the time-dependent system in shear motion. Strong dependence of PFPE bulk viscosity on PFPE molecular structure (e.g., end group functionality) and external conditions (e.g., temperature) was observed. Via a nonlinear regression method, we further extracted the relaxation time spectrum based on our simulated dynamic moduli data, where the importance of end group couplings was emphasized. In addition, we adopted two solid surfaces to mimic the head and disk, which will provide a further understanding in lubricant nanorheology and nanotribology.
URI
http://dspace.inha.ac.kr/handle/10505/1581
ISSN
0018-9464
Appears in Collections:
College of Engineering(공과대학) > Polymer Science and Engineering (고분자공학) > Journal Papers, Reports(고분자공학 논문, 보고서)
Files in This Item:
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