2015
DOI: 10.1021/mz500773v
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Shape Actuation via Internal Stress-Induced Crystallization of Dual-Cure Networks

Abstract: We demonstrate a single-phase, two-way shape actuator that, in the absence of an external load, elongates upon cooling and reversibly contracts upon heating. In a simple and straightforward process, a partially cross-linked, semicrystalline poly­(ε-caprolactone) (PCL) network is melted, stretched to several hundred percent strain, and further cross-linked. Upon removal of the applied load, the elastic double network adopts a “state-of-ease” that retains part of its former strain. When cooled, internal stress-i… Show more

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Cited by 107 publications
(116 citation statements)
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“…(b)], confirming the explanation. This phenomenon was also well understood through small‐angle X‐ray scattering (SAXS) in a few previous reports …”
Section: Resultsmentioning
confidence: 58%
“…(b)], confirming the explanation. This phenomenon was also well understood through small‐angle X‐ray scattering (SAXS) in a few previous reports …”
Section: Resultsmentioning
confidence: 58%
“…15 Strain-induced crystallization of PCL has enabled two-way shape memory 18 and recently stress-free shape actuation. 19 The role of network architecture on strain-induced crystallization and on the performance of cold-drawn shapememory polymers remains unclear. It is well-known that network characteristics such as the molecular weight distribution between cross-links, cross-link functionality and spatial distribution, and the presence of dangling chains and primary loops have large effects on elastomeric properties.…”
Section: ■ Introductionmentioning
confidence: 99%
“…Shape‐memory materials are a class of smart materials that respond to external stimuli, typically temperature and their applications have expanded steadily as well as academic and industry. Shape‐memory polymers (SMP) have received more attention owing to their low cost, low density, easy processability compared with shape‐memory alloys, ceramics, hydrogels, etc . However, SMPs suffer from relatively weak recovery force due to their low stiffness when compared with most other shape memory alloys.…”
Section: Introductionmentioning
confidence: 99%