Abstract
Viscosity/shear effects have been evaluated for cetane and tetralin solutions of polyisobutene. Eleven polymers, molecular weights 224 to 71000, were studied at temperatures from 100° to 135°C. Systems from pure solvent to 100 per cent polymer were tested with capillaries and with two types of rotational viscometers. The results yield concepts from which conditions and magnitudes for non-Newtonian flow may be predicted. The onset of non-Newtonian flow occurs above the transition in a plot of log low-shear viscosity versus log polyisobutene molecular weight. The transition occurs at a critical polymer concentration and molecular weight corresponding to the conditions for extensive polymer chain entanglement.
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