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Strain hardening of polycarbonate in the glassy state: Influence of temperature and molecular weight

Authors

  • L. E. Govaert,

    Corresponding author
    1. Eindhoven University of Technology, Materials Technology (MaTe), P.O. Box 513, 5600 MB Eindhoven, The Netherlands
    • Eindhoven University of Technology, Materials Technology (MaTe), P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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  • T. A. Tervoort

    1. Eidgenössische Technische Hochschule Zürich, Department of Materials, ETH Zentrum, UNO C15, Universitätstrasse 41, CH-8092 Zurich, Switzerland
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Abstract

This study is concerned with the temperature and molecular weight dependence of the strain-hardening behavior of polycarbonate. It is shown that the strain-hardening modulus reduces with increasing temperature and decreasing molecular weight. This result is interpreted in terms of temperature accelerated relaxation of the entanglement network. Moreover, it is shown that frozen-in orientations, induced by homogeneous deformations above the glass transition temperature, lead to anisotropic yield behavior that can be fully rationalized (and modelled) in terms of a superimposed stress contribution of the prestrained network. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 2041–2049, 2004

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