In this section
Many Tribology Group publications are Open Access thanks to funding from the EPSRC.
@article{Dardin:2005,
author = {Dardin, A and Hedrich, K and Müller, M and Topolovec-Miklozic, K and Spikes, H},
journal = {Tribologia},
pages = {3--14},
title = {Influence of polyalkylmethacrylate viscosity index improvers on boundary film formation and efficiency of lubricants},
volume = {24},
year = {2005}
}
TY - JOUR
AB - The efficiency of lubricated machine elements such as transmissions, crankcase engines, and hydraulic pumps depends strongly on the friction properties of the lubricant employed. For the design of modern, highly efficient lubricants it is thus essential to understand the influence of the components of the lubricating fluid in terms of boundary film formation and friction. PAMAs are well-known as viscosity index improve rs and dispersant boosters. This paper shows that PAMAs are able to adsorb from oil solution on to metal surfaces, to produce thick, viscous boundary films. These films enhance lubricant film formation in slow speed and high temperature conditions and thus produce a significant reduction in friction in engine and transmission lubrication. A systematic study of this phenomenon has made use of the highly flexible nature of PAMA chemistry. A range of dispersant and non-dispersant polymethacrylates has been synthesised having different functionalities, molecular weights and architectures. The influence of each of these factors on both boundary film formation and friction has been explored using optical interferometry and friction-speed charting. From the results, guidelines have been developed for designing PAMAs having optimal boundary lubricating properties. Bench tests which more closely simulate the proposed application of the lubricants have been used to measure their torque transmitting efficiency (FZG gear test). First results from these tests demonstrate that the identified structure-property relations can be transferred into real gear and ATF oils.
AU - Dardin,A
AU - Hedrich,K
AU - Müller,M
AU - Topolovec-Miklozic,K
AU - Spikes,H
EP - 14
PY - 2005///
SN - 0780-2285
SP - 3
TI - Influence of polyalkylmethacrylate viscosity index improvers on boundary film formation and efficiency of lubricants
T2 - Tribologia
VL - 24
ER -