Time-dependent, non-Newtonian behavior of viscoelastic materials
In order to put our effort into proper perspective of rheological constitutive relations as a whole, we repeat (6) a few brief introductory comments. One of the fundamental problems in polymer rheology is the establishment of a basic rheological equation which effectively describes the nonlinear deformation-time flow history. The need of such an equation to relate shear stress, normal stress, shear rate, and time is necessary in the solution of many flow problems. The equation may involve one or more constants, depending on the complexity of the relation, and a variety of experiments is used to evaluate these. A systematic investigation and correlation of the material constants as a function of molecular weight, structure, concentration, and temperature, might give some insight into the basic mechanism of polymer flow, if such constants are the result of a logical theory.
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