Effects of average molecular weight and concentration of polymer additive on friction and wear

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · ASLE Transactions (American Society of Lubrication Engineers); (USA)

DOI:https://doi.org/10.1080/10402009008981951· OSTI ID:7064431

Yoshida, Kazuo ^[1]

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1. Kyodo Oil Technical Research Center, Toda (Japan)

Tribological behavior with oils containing polymethacrylates (PMAs) differing in average molecular weight, Mw, is examined in sliding concentrated contacts. At low loads, low PMA Mw or higher concentrations of PMA have a beneficial effect on wear, but at high loads, PMAs are detrimental. The beneficial effect is attributed to elastohydrodynamic film formation. The most important parameter is the number of PMA molecules per unit oil volume. The prowear action can be explained by the fact that PMA molecules may accumulate in the inlet region of the contact. The polymer accumulation may block the base oil entering the contact leading to oil starvation which in turn leads to severe contacts and increases in wear. This anomalous behavior may result from the competition between the prowear action and oil film formation. 13 refs.

• OSTI ID: 7064431
• Journal Information: ASLE Transactions (American Society of Lubrication Engineers); (USA), Journal Name: ASLE Transactions (American Society of Lubrication Engineers); (USA) Vol. 33; ISSN 0569-8197; ISSN ASLTA
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320302* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Materials
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
ADDITIVES
ESTERS
FRICTION
LUBRICANTS
LUBRICATING OILS
MECHANICAL PROPERTIES
MOLECULAR WEIGHT
OILS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PMMA
POLYACRYLATES
POLYMERS
POLYVINYLS
SLIDING FRICTION
TRIBOLOGY
VISCOSITY
WEAR RESISTANCE