Abstract
While linear viscoelastic properties are very helpful in establishing the molecular structure of polymers, the deformations that occur in processing machinery are always large and rapid, and under these conditions melt behavior is decidedly nonlinear. One manifestation of this is that the response to a shearing deformation no longer provides a complete description of rheological behavior. The molecular processes that give rise to nonlinear viscoelasticity are described as well as several large and rapid deformations that used to obtain information about nonlinear behavior. These include large-amplitude oscillatory shear and extensional flow.
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Dealy, J.M., Wang, J. (2013). Nonlinear Viscoelasticity: Phenomena. 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_4
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DOI: https://doi.org/10.1007/978-94-007-6395-1_4
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