Abstract
In this study, we have investigated the lubricating properties of an aqueous fluid prepared with polyoxamer triblock copolymer in water, namely “F127-20” (F127 at the concentration of 20% wt./vol.). In coherence with its well-known thermo-responsive rheological properties, lubricating properties of F127-20 also displayed varying lubricating properties, both in the lubricating mechanism and efficacy, as a function of temperature, speed and tribopairs. F127-20 was most effective in lubricating a soft interface (PDMSePDMS) based on its gel-forming properties in 22.5-60 °C and feasible formation of hydrodynamic lubricating films at all speeds. More importantly, enhanced shear thinning of F127-20 and an optimum pressure opposed from PDMSePDMS tribological contact led to a substantial reduction in viscosity of the lubricant and smooth gliding of the interface while maintaining fluidic lubricating films. At temperatures lower or higher than temperature range 22.5-60 °C, F127-20 behaved as a liquid, and boundary lubrication became the dominant lubrication mechanism. © 2014 Elsevier Ltd. All rights reserved.
Original language | English |
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Journal | Polymer |
Volume | 55 |
Issue number | 22 |
Pages (from-to) | 5708-5717 |
ISSN | 0032-3861 |
DOIs | |
Publication status | Published - 2014 |
Keywords
- F127
- Thermo-responsive
- Lubrication