Results 231 to 240 of about 1,774 (282)

Boundary Film Formation by Viscosity Index Improvers

Tribology Transactions, 1996
Ultrathin film interferometry has been used to measure the film-forming properties of a range of viscosity index improver (VII) solutions in rolling, concentrated contacts. It has been shown that some VIIs form boundary lubricating films of thickness 10 to 30 nm in contacts.
Matthew Smeeth, Hugh Spikes, Selda Gunsel   +2 more
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A Rating System for Viscosity Index Improvers

SAE Technical Paper Series, 1973
<div class="htmlview paragraph">The purpose of the work reported in this paper was to develop a simple and reliable method of comparing the relative merits of various polymers in a homogeneous sytem of base oils that might be used in multigraded motor oil applications.
J. V. Brancato, Wildrick Hart
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Production and Application Properties of Dispersive Viscosity Index Improvers

Industrial & Engineering Chemistry Research, 2012
Polymeric dispersive viscosity index improvers of lubricating mineral oils based on styrene, dodecyl-methacrylate, octadecyl methacrylate and N, N-dimethylaminoethyl methacrylate (d-PSAMA) were produced by performing copolymerizations isothermally up to the high-conversion in mineral base oil solution, using monofunctional or bifunctional peroxide ...
Šoljić Jerbić, Ivana, Parlov Vuković, Jelena, Jukić, Ante   +2 more
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Reduction of Friction by Functionalised Viscosity Index Improvers

Tribology Letters, 2007
A range of functionalised polymethacrylate copolymers have been synthesised with different functionalities, polymer architecture and molecular weight. It is shown that appropriately functionalised block copolymers give enhanced film thickness and greatly reduced friction under low entrainment speed conditions, even with polymer concentration as low as ...
J. Fan, M. Müller, T. Stöhr, H. A. Spikes   +3 more
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Viscosity Index Improvers and Thickeners

2009
Early in the history of the lubricants industry, the viscosity index (VI) was an important measure of quality, providing an indication of the potential of an oil for application over a wide temperature range. Pennsylvania grade oils (∼ 100 VI) were the standard against which all others were measured.
R.L. Stambaugh, B.G. Kinker
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Evaluation of a Butadiene-Styrene Viscosity Index Improver

SAE Technical Paper Series, 1976
<div class="htmlview paragraph">Extensive laboratory and field test data are presented on multigrade motor oils formulated with a new VI improver developed by Phillips Petroleum Company. This VI improver is a hydrogenated copolymer of butadiene and styrene.
W. L. Streets, K. H. Yochum, Bill Mitacek   +2 more
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Performance of Viscosity Index Improvers in Lubricated Contacts

Langmuir, 1996
The boundary film forming properties of polymeric viscosity index improvers are examined in an elastohydrodynamic (EHD) contact. Ultrathin interferometry is used, a recent development of conventional optical interferometry, which allows the film thickness generated in a point contact to be measured down to a value of 1 nm.
Matthew Smeeth, Hugh Spikes, Selda Gunsel   +2 more
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Motor Oil Consumption Characteristics - Volatility, Viscosity, Viscosity Index, and Viscosity Index Improvers

SAE Technical Paper Series, 1949
<div class="htmlview paragraph"><b>L</b>ABORATORY and road tests are reported that show volatility, viscosity, and viscosity index to be the three most important physical properties affecting the consumption tendencies of motor oils.</div> <div class="htmlview paragraph">These tests indicate further that oils having low ...
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Viscosity index. I. Evaluation of selected copolymers incorporating n‐octadecyl acrylate as viscosity index improvers

Journal of Applied Polymer Science, 1978
AbstractCompositionally and structurally varied copolymers all containing n‐octadecyl acrylate were prepared and evaluated as viscosity index improvers in a common base oil under conditions of low shear. Systems evaluated over a range of copolymer and blend composition were: copolymers of n‐octadecyl acrylate with, respectively, methyl methacrylate, 2 ...
Edmund F. Jordan, Steven Smith, Ronald E. Koos, Winfred E. Parker, Bohdan Artymyshyn, A. N. Wrigley   +5 more
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Laboratory shearing tests for viscosity index improvers

Tribotest, 1996
AbstractThe relative resistance of VI improvers to breakdown depends on internal structural parameters (chemical type, ratio of monomers, degree of branching) as well as on external factors (test type, duration, severity).Of the many bench tests available to screen shear stability, the 30 cycle CEC injector test is most commonly used for engine oils ...
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