Titlebook: Melt Rheology and Its Role in Plastics Processing; Theory and Applicati John M. Dealy,Kurt F. Wissbrun Book 19991st edition Springer Scienc

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Introduction to Nonlinear Viscoelasticity,e readily measured, and they can be related to certain aspects of the molecular structure of a polymer. Moreover, the theory of linear viscoelasticity presented in Chapter 2, i.e., the Boltzmann superposition principle, is useful in providing relationships between the data obtained in different type

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Transient Shear Flows Used to Study Nonlinear Viscoelasticity,rate is very small. But there are very few, if any, commercial melt processing operations in which the flow satisfies either of these criteria. Thus, while linear viscoelastic behavior has some application in material characterization, it cannot, in general, be correlated with melt performance in pr

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Extensional Flow Properties and Their Measurement,en the material functions that are determined using various types of deformations. For example, this theory tells us that in start-up flow, the shear stress growth coefficient, ..(.), is independent of shear rate. Furthermore, it provides a simple relationship between this material function and the

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Rotational and Sliding Surface Rheometers,p; and drag flow rheometers in which one bounding wall moves relative to a second, stationary wall. Pressure-driven rheometers are described in Chapter 8, and the present chapter deals with drag flow instruments.

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