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Modeling the Relaxation Mechanisms of Amorphous Shape Memory Polymers

Authors

  • Thao. D. Nguyen,

    Corresponding author
    1. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218 (USA)
    • Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218 (USA).
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  • Christopher M. Yakacki,

    1. Research and Development, MedShape Solutions Inc., Atlanta, GA 30318 (USA)
    2. School of Materials Science and Engineering, The Georgia Institute of Technology, Atlanta, GA 30332 (USA)
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  • Parth D. Brahmbhatt,

    1. Research and Development, MedShape Solutions Inc., Atlanta, GA 30318 (USA)
    2. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332 (USA)
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  • Matthew L. Chambers

    1. Research and Development, MedShape Solutions Inc., Atlanta, GA 30318 (USA)
    2. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332 (USA)
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Errata

This article is corrected by:

  1. Errata: Correction: Modeling the Relaxation Mechanism of Amorphous Shape Memory Polymers Volume 23, Issue 25, 2778, Article first published online: 1 July 2011

Abstract

In this progress report, we review two common approaches to constitutive modeling of thermally activated shape memory polymers, then focus on a recent thermoviscoelastic model that incorporates the time-dependent effects of structural and stress relaxation mechanisms of amorphous networks. An extension of the model is presented that incorporates the effects of multiple discrete structural and stress relaxation processes to more accurately describe the time-dependent behavior. In addition, a procedure is developed to determine the model parameters from standard thermomechanical experiments. The thermoviscoelastic model was applied to simulate the unconstrained recovery response of a family of (meth)acrylate-based networks with different weight fractions of the crosslinking agent. Results showed significant improvement in predicting the temperature-dependent strain recovery response.

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