Light-Scattering Study of the Glass Transition in Lubricants

[+] Author and Article Information
M. A. Alsaad, W. O. Winer

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga.

F. D. Medina, D. C. O’Shea

School of Physics, Georgia Institute of Technology, Atlanta, Ga.

J. of Lubrication Tech 100(3), 418-422 (Jul 01, 1978) (5 pages) doi:10.1115/1.3453201 History: Received June 30, 1977; Online October 20, 2010


The sound velocity of four lubricants has been measured as a function of temperature and pressure using Brillouin scattering. A change in slope of the velocity as a function of temperature or pressure allowed the determination of the glass transition temperature and pressure. The glass transition data were used to construct a phase diagram for each lubricant. The data indicate that Tg increased with pressure at a rate which ranged from 120 to 200 C/GPa. The maximum pressure attained was 0.69 GPa and the temperature range was from 25 to 100 C.

Copyright © 1978 by ASME
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