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Research Papers

Constitutive Modeling of Shape Memory Effects in Semicrystalline Polymers With Stretch Induced Crystallization

[+] Author and Article Information
Kristofer K. Westbrook, Martin L. Dunn

Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309

Vikas Parakh, Patrick T. Mather

Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244

Taekwoong Chung

Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106

Logan C. Wan

 Fairview High School, Boulder, CO 80305

H. Jerry Qi1

Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309

1

Corresponding author.

J. Eng. Mater. Technol 132(4), 041010 (Sep 29, 2010) (9 pages) doi:10.1115/1.4001964 History: Received August 30, 2009; Revised April 18, 2010; Published September 29, 2010; Online September 29, 2010

Polymers can demonstrate shape memory (SM) effects by being temporarily fixed in a nonequilibrium shape and then recover their permanent shape when exposed to heat, light, or other external stimuli. Many previously developed shape memory polymers (SMPs) use the dramatic molecular chain mobility change around the glass transition temperature Tg to realize the SM effect. In these materials, the temporary shape cannot be repeated unless it is reprogramed, and therefore the SM effect is one way. Recently, a semicrystalline SMP, which can demonstrate both one- and two-way SM effects, was developed by one of our groups (Chung, T., Rorno-Uribe, A., and Mather, P. T., 2008, “Two-Way Reversible Shape Memory in a Semicrystalline Network,” Macromolecules, 41(1), pp. 184–192). The main mechanism of the observed SM effects is due to stretch induced crystallization. This paper develops a one-dimensional constitutive model to describe the SM effect due to stretch induced crystallization. The model accurately describes the complex thermomechanical SM effect and can be used for the future development of three-dimensional constitutive models.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Two-way shape memory effects demonstrated by the PCO material under different stresses

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Figure 7

Effects of temperature rates on the actuation strain for the case of cooling followed by holding the sample

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Figure 6

Effects of temperature rates on the two-way SM effects under 500 kPa stress: (a) actuation strain, (b) actuation strain immediately after cooling, and (c) SIC volume fraction

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Figure 5

Comparison between the model simulation and the experiment for the one-way SM effect under 600 kPa stress

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Figure 4

Comparisons between model predictions and experimental results for the case of 500 kPa and 600 kPa imposed stresses

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Figure 3

(a) Model fit to the experimental result for the case of imposed stress 700 kPa. (b) Comparisons between mechanical actuation stretch and effective stretch in SIC.

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Figure 2

One-way SM effect demonstrated by PCO under 600 kPa stress

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