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Strain hardening of polycarbonate in the glassy state: Influence of temperature and molecular weight
Authors:L. E. Govaert  T. A. Tervoort
Affiliation:1. Eindhoven University of Technology, Materials Technology (MaTe), P.O. Box 513, 5600 MB Eindhoven, The Netherlands;2. Eidgenössische Technische Hochschule Zürich, Department of Materials, ETH Zentrum, UNO C15, Universitätstrasse 41, CH-8092 Zurich, Switzerland
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
Keywords:polymer glasses  polycarbonate  anisotropic yielding  strain hardening  viscoelasticity
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