Cited by 149Advanced Materials and MechanicsPolymer composites and self-healingDielectric materials and actuators

Two-way reversible shape memory effects in a free-standing polymer composite

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Westbrook, Kristofer K, Mather, Patrick T, Parakh, Vikas, Dunn, Martin L, Ge, Qi, Lee, Brendan M, Qi, H Jerry·2011·Smart Materials and Structures

Abstract

Shape memory polymers (SMPs) have attracted significant research efforts due to their ease in manufacturing and highly tailorable thermomechanical properties.SMPs can be temporarily programmed and fixed in a nonequilibrium shape and are capable of recovering the original undeformed shape upon exposure to a stimulus, the most common being temperature.Most SMPs exhibit a one-way shape memory (1W-SM) effect since one programming step can only yield one shape memory cycle; an additional shape memory cycle requires an extra programming step.Recently, a novel SMP that demonstrates both 1W-SM and two-way shape memory (2W-SM) effects was demonstrated by one of the authors (Mather).However, to achieve two-way actuation this SMP relies on a constant externally applied load.In this paper, an SMP composite where a pre-stretched 2W-SMP is embedded in an elastomeric matrix is developed.This composite demonstrates 2W-SM effects in response to changes in temperature without the requirement of a constant external load.A transversal actuation of ∼10% of actuator length is achieved.Cyclic tests show that the transversal actuation stabilizes after an initial training cycle and shows no significant decreases after four cycles.A simple analytic model considering the programming stress and actuator dimensions is presented and shown to agree well with the transverse displacement of the actuator.The model also predicts that larger actuation can be achieved when larger pre-stretch of 2W-SMP is used.The scheme used for this polymer composite can promote the design of new shape memory composites at micro-and nano-length scales to meet different application requirements.

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Crossref · 10.1088/0964-1726/20/6/065010

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  • Few works consider the two-way SME under stress conditions in semi-crystalline crosslinked polymers.

    “In fact, few works considering the two-way SME under stress conditions in semi-crystalline crosslinked polymers are available [103,104,167,277,278].”
  • A two-way shape memory cylinder made by embedding a pre-stretched semicrystalline SMP into an elastomeric matrix achieved transversal actuation of about 10% of actuator length.

    “A transversal actuation of w10% of actuator length is achieved.”

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Authors
Westbrook, K. K., Mather, P. T., Parakh, V., Dunn, M. L., Ge, Q., Lee, B. M., & Qi, H. J.
Affiliations
  • University of Colorado Boulder (US)
  • Syracuse University (US)
Venue
Smart Materials and Structures
Published
2011-05-23
Volume
20
Issue
6
Pages
065010
ISSN
  • 0964-1726 (ISSN-L)
  • 1361-665X
OpenAlex
W2142466888
Cited by
149
References
20
Citations by year
2026: 1 · 2025: 11 · 2024: 3 · 2023: 6 · 2022: 12 · 2021: 14 · 2020: 16 · 2019: 17 · 2018: 16 · 2017: 13 · 2016: 7 · 2015: 10 · 2014: 11 · 2013: 8 · 2012: 4
FWCI
13.04
Type
journal article
Language
en
Open access
Locations
Smart Materials and Structures (publishedVersion)
Funders
  • National Science Foundation (0758631, 0645219)
  • Division of Materials Research (DMR-0758631)
  • Division of Civil, Mechanical and Manufacturing Innovation
  • Air Force Office of Scientific Research (FA9550-, FA9550-09-1-0195)
Topics
  • Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
  • Physical Sciences › Engineering › Biomedical Engineering › Dielectric materials and actuators
Keywords
shape memory polymers, two-way shape memory effect, polymer composites, elastomer matrix, pre-stretching

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