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Rheological properties of shear viscosity and dynamic moduli of perfluoropolyether (PFPE) with different molecular weights and end group functionalities were measured. Molecular simulation of non-equilibrium molecular dynamics (NEMD) was also performed to provide a molecular visualization tool to predict shear viscosity, which reveals a strong dependence on temperature and PFPE molecular architecture.
In this paper, humidity effects on the relaxation of perfluoropolyether (PFPE) films were examined by bonded fraction and surface energy measurements. MD simulation with a bead-spring model was also performed. The calculated relaxation time for a functional PFPE molecule in the film was found to be shorter at high humidity, which is consistent with the experimental results.
The self-healing/spreading capability of perfluoropolyether (PFPE) film is critical to handle recurring contacts as well to the long-term reliability of drives. Here the spontaneous spreading of lubricant nanofilms on carbon overcoats via optical surface analyzer (OSA) and molecular dynamics (MD) simulations to demonstrate molecular conformation as well as diffusion characteristics was investigated...
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