Date of Award


Publication Type

Master Thesis

Degree Name



Civil and Environmental Engineering


Engineering, Environmental.


Asfour, A. A.




Four polymers were dissolved in a dewaxed base oil to concentrations of 0.1, 0.2, 0.3, 0.5, and 0.7% by mass to determine their potential as viscosity index improvers (VIIs). The polymers employed in this study included a hydrogenated diene copolymer, a dispersant olefin copolymer, an olefin copolymer, and polymethacrylate. Kinematic viscosities and densities of the base oil and dilute-polymer solutions were measured at $-25,-20,-10$, 0, 10, 20, 40, 60, 80, 100, 120, and 150$\sp\circ$C. Since it was not possible to measure the densities at $-30,-15,-5$, and 5$\sp\circ$C, only the kinematic viscosities were recorded. Relative and specific viscosities of dilute-polymer solutions were plotted against concentration and temperature, respectively to evaluate the polymeric influence on the viscometric properties of each system. Intrinsic viscosity was used to give a measure of the polymer's ability to increase viscosity of the oil at infinite dilution. The hydrogenated diene copolymer, dispersant olefin copolymer, and olefin copolymer exhibited an increasing loss of fluidity below the cloud point. At a similar temperature the polymethacrylate did not show any significant loss of fluidity. This proves that this change in the viscometric properties is a polymer-oil dependent interaction. The olefin copolymer yielded the greatest overall thickening. The polymethacrylate was the only polymer to exhibit an increasing contribution to viscosity with increasing temperature, and also some pour point depression at $-25\sp\circ$C. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1997 .W365. Source: Masters Abstracts International, Volume: 37-01, page: 0333. Adviser: A. A. Asfour. Thesis (M.A.Sc.)--University of Windsor (Canada), 1997.