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HERO ID
3860653
Reference Type
Journal Article
Title
Non-equilibrium responses of PFPE lubricants with various atomistic/molecular architecture at elevated temperature
Author(s)
Chung, PilS; Song, W; Biegler, LT; Jhon, MS
Year
2017
Volume
7
Issue
5
DOI
10.1063/1.4978639
Web of Science Id
WOS:000402797100320
Abstract
During the operation of hard disk drive (HDD), the perfluoropolyether (PFPE) lubricant experiences elastic or viscous shear/elongation deformations, which affect the performance and reliability of the HDD. Therefore, the viscoelastic responses of PFPE could provide a finger print analysis in designing optimal molecular architecture of lubricants to control the tribological phenomena. In this paper, weexamine the rheological responses of PFPEs including storage (elastic) and loss (viscous) moduli (G' and G '') by monitoring the time-dependent-stress-strain relationship via non-equilibrium molecular dynamics simulations. We analyzed the rheological responses by using Cox-Merz rule, and investigated the molecular structural and thermal effects on the solid-like and liquid-like behaviors of PFPEs. The temperature dependence of the endgroup agglomeration phenomena was examined, where the functional endgroups are decoupled as the temperature increases. By analyzing the relaxation processes, the molecular rheological studies will provide the optimal lubricant selection criteria to enhance the HDD performance and reliability for the heat-assisted magnetic recording applications. (C) 2017 Author(s).
Tags
PFAS
•
Expanded PFAS SEM (formerly PFAS 430)
Perfluoropentanesulfonate
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFPeS (2706-91-4)
Literature Search
WOS
•
PFAS Universe
Data Source
Web of Science
Perfluoropentanesulfonate
Perfluoropentanesulfonic acid
•
PFPeS
Literature Search
WOS
Screening Results
Excluded/Not on Topic
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