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Melt Rheology and its Applications in the Plastics Industry pp 49–89Cite as

Linear Viscoelasticity

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Part of the book series: Engineering Materials and Processes ((EMP))

Abstract

Linear viscoelasticity is a type of behavior exhibited by molten polymers when the deformation is very small or very slow. Such behavior can be described completely by the relaxation modulus, which is determined by measuring the response of the melt to a sudden, small deformation. Alternatively it can be characterized in terms of the storage and loss moduli that are measured in small-amplitude oscillatory shear or the creep compliance measured by suddenly imposing a shear stress and tracking the deformation. A convenient mathematical form for the relaxation modulus is a sum of exponentials, which is called the generalized Maxwell model. The set of moduli and time constants involved in this model comprise a discrete relaxation spectrum. The dependence of these properties on temperature is described, and molecular models for their prediction are presented.

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Authors and Affiliations

  1. Montreal, QC, H3Z 2L7, Canada

    John M. Dealy

  2. N Brazosport Blvd B-1470D 2301, Freeport, TX, 77541-3203, USA

    Jian Wang

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  1. John M. Dealy
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  2. Jian Wang
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Correspondence to John M. Dealy .

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Dealy, J.M., Wang, J. (2013). Linear Viscoelasticity. In: Melt Rheology and its Applications in the Plastics Industry. Engineering Materials and Processes. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6395-1_3

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