Abstract
A brief review of the linear theory of viscoelasticity is given for both steady flow behavior and sinusoidal deformations. The causes and the molecular interpretation for departure from linear theory is discussed. A discussion is presented as to why one might expect molecules of biological importance to be more prone to non-linear behavior than synthetic polymers which have been the focal point of much of the experimental work performed in the area, to date. Examples are given for dispersions of lecithin in water.
The concept of a weak structure in the material is presented such that Bingham-like behavior is obtained. Often the nature of the experiment destroys the structure and hence obscures the Bingham-like behavior.
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