Accession Number : AD0777953

Title :   The Applicability of Light Scattering Spectroscopy to the Measurement of the Viscoelastic Parameters of Lubricants.

Descriptive Note : Technical rept.,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C VITREOUS STATE LAB

Personal Author(s) : Dill,James F. ; Drake,Peter W. ; Litovitz,Theodore A.

Report Date : MAR 1974

Pagination or Media Count : 43

Abstract : Various techniques for the measurement of the viscoelastic properties of lubricants are described. These include a novel method using light scattering and photon correlation spectroscopy. This combination of techniques has been applied to a detailed viscoelastic study of the lubricant 5P4E (a polyphenyl ether manufactured by Monsanto Chemical Corp.). The results reported include; Sound velocity measurements obtained by both light scattering and ultrasonics; measurements of the structural relaxation function and the average structural relaxation times using digital correlation spectroscopy; and static shear viscosity. These measurements have all been made as a function of pressure. The results demonstrate that the light scattering techniques can extend the range of viscosity measurements by at least four orders of magnitude. (Modified author abstract)

Descriptors :   *Viscoelasticity, *Lubricants, *Light scattering, Pressure, Acoustic velocity, Correlation techniques, Relaxation time, Shear properties, Viscosity, Phenyl ether, Spectrum analysis, Spectroscopy, Ultrasonics, Fluids, Measurement

Subject Categories : Lubricants and Hydraulic Fluids
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE