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Extension of molten polymers

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Polymer Processing

Part of the book series: Advances in Polymer Science ((POLYMER,volume 93))

Abstract

This contribution reviews the major results of studies of the extension of molten polymers which have been carried out recently. The authors discuss systematically basic regularities of the extension of molten polydisperse polymers including the uniform extension and its development in time (at a constant strain velocity and at constant extrusion force). The article also considers the dependency of stress and strain velocity upon elastic strain, stress and strain relaxation processes; the major differences in the variations of effective viscosity under extension are pointed out. The authors describe the effect of polymer fluid flow retardation under high elastic strains.

The article reviews the latest achievements in the sphere of theoretical descriptions of the molten polydisperse polymers and gives various molecular-kinetic models of extension.

Also described are some important technological applications in the processing of polymers, including the methods of examination and verification of the properties of raw materials by means of tests in which molten polymers are extended at a constant force, and molding of sleeve-type and flat films.

The analysis has corroborated that the extension experiments were highly informative and important for science and technology.

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Authors and Affiliations

  1. USSR Research Institute of Plastic Materials, Perovsky pr. 35, 111 112, Moskow, USSR

    M. L. Fridman & V. D. Sevruk

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  1. M. L. Fridman
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  2. V. D. Sevruk
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M. L. Fridman

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© 1990 Springer-Verlag

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Fridman, M.L., Sevruk, V.D. (1990). Extension of molten polymers. In: Fridman, M.L. (eds) Polymer Processing. Advances in Polymer Science, vol 93. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0025813

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  • DOI: https://doi.org/10.1007/BFb0025813

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  • Print ISBN: 978-3-540-51376-6

  • Online ISBN: 978-3-540-46202-6

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