J. E. Bujake
Jun 1, 1968
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Influential Citations
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Journal
Journal of Colloid and Interface Science
Abstract
Abstract Creep compliances of sodium stearate containing 19.7% to 35.7% water were measured over a temperature range of 5° to 60°C using a simple shear creep apparatus. The data indicated that the viscoelastic behavior of sodium stearate was linear up to shear strains of 0.7%. The creep curves were separated into three components: an instantaneous elastic compliance, a retarded elastic compliance, and viscous flow; at 25°C, sodium stearate with 19.7% water gave values of about 5 × 10−9 and 7 × 10−8 cm2/dyne and 1.5 × 1011 poise, respectively. An activation energy for viscous flow of 11.7 kcal/mole was calculated. The effect of three orthogonal orientations of the stearate samples on the compliances and viscosity was determined, and the extent of orientation was estimated by light transmission experiments. Steady-state compliance data indicated a network structure in sodium stearate tighter than that of amorphous polymers.