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Shapeshifting: Reversible Shape Memory in Semicrystalline Elastomers

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Department of Chemistry, University of North Carolina at Chapel Hill, North Carolina 27599-3290, United States
Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut 06268, United States
§ Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton New York 11973, United States
*(S.S.S.) E-mail: [email protected]
Cite this: Macromolecules 2014, 47, 5, 1768–1776
Publication Date (Web):February 25, 2014
https://doi.org/10.1021/ma4023185
Copyright © 2014 American Chemical Society
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Abstract

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We present a general strategy for enabling reversible shape transformation in semicrystalline shape memory (SM) materials, which integrates three different SM behaviors: conventional one-way SM, two-way reversible SM, and one-way reversible SM. While two-way reversible shape memory (RSM) is observed upon heating and cooling cycles, the one-way RSM occurs upon heating only. Shape reversibility is achieved through partial melting of a crystalline scaffold which secures memory of a temporary shape by leaving a latent template for recrystallization. This behavior is neither mechanically nor structurally constrained, thereby allowing for multiple switching between encoded shapes without applying any external force, which was demonstrated for different shapes including hairpin, coil, origami, and a robotic gripper. Fraction of reversible strain increases with cross-linking density, reaching a maximum of ca. 70%, and then decreases at higher cross-linking densities. This behavior has been shown to correlate with efficiency of securing the temporary shape.

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Detailed properties of characterized materials, AFM and SAXS analysis on two-way reversiblilty, analysis on variation of degree of crystallinity, kinetic effect on reversibility and composite model of crystalline network, and a video showing a practical use of the polymer. This material is available free of charge via the Internet at http://pubs.acs.org.

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