Characterization and modeling of elastocaloric effects of shape memory poly(cyclooctene)

Hong, Seok Bin; An, Yongsan; Yu, Woong‐Ryeol

doi:10.1063/1.5082357

Cited by 9 publications

(13 citation statements)

References 23 publications

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“…SMPs, a group of a smart polymer, are cheaper, more flexible, and easier to be manufactured and processed than SMAs [26], so that SMPs are of significance in flexible/wearable electronics [27] and biomedical research fields [28]. Recently, the elastocaloric effect arising from the mechanism (ii) in an SMP has been reported [29], but the effect in the linear elastic response regime with small strain and stress has not been investigated yet. Although there are many SMPs, in this work, we used SMPs composed of poly(ε-caprolactone), one of the conventional semicrystalline SMPs [30,31].…”

Section: Introductionmentioning

confidence: 99%

Elastocaloric effect of shape memory polymers in elastic response regime

et al. 2023

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The solid-state cooling/heating technology based on the elastocaloric effect is one of the promising alternatives to vapor compression systems. The large elastocaloric temperature modulation is often generated through the non-linear strain-induced structural transition by applying large strain and/or stress to ferroelastic materials. Recently, an unconventional approach to expand the application possibilities of the elastocaloric effect was demonstrated by processing elastocaloric materials into kirigami structures, which was inspired by the art of paper cutting. By using this approach, only a small stretch of processed conventional plastics can locally provide more efficient performance of elastocaloric temperature modulation than that of ferroelastic materials. To further improve such a unique functionality, it is necessary to find plastic or polymeric materials showing large elastocaloric effects in the linear elastic response regime that can be driven by a MPa-order weak stress application, where the non-linear structural transition is irrelevant. In this work, by means of recently developed measurement technique for the elastocaloric effect based on the lock-in thermography, we found that shape memory polymers (SMPs) show prominent performance of the elastocaloric temperature modulation that is larger than conventional plastics. SMPs enable the control of the crystallinity by changing the cross-linking agents, melting temperature by changing the degree of polymerization, and orientation of the polymer chain segment by the shape memory effect. By utilizing the unique properties of SMPs, we manipulated their elastocaloric performance. The experimental results reported here will highlight the potential of smart polymers for flexible and durable elastocaloric applications.

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Section: Introductionmentioning

confidence: 99%

Elastocaloric effect of shape memory polymers in elastic response regime

et al. 2023

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“…Currently, the shape memory effect is translated to a variety of polymer systems such as amorphous polymer, semicrystalline polymer, and liquid crystalline elastomer 7 . Amorphous systems widely include polyurethanes and epoxy systems, while crystalline polymer includes poly (cyclooctene) and poly(ethylene‐co‐vinyl acetate) 14–26 . On the other hand, Liquid crystalline elastomer was a remarkable invention by Mather et al, who showed that these materials could undergo nematic to isotropic liquid crystalline transition (rather than a T g or T m ) that provided the molecular switching motion to the network 27,28 .…”

Section: Introductionmentioning

confidence: 99%

“…7 Amorphous systems widely include polyurethanes and epoxy systems, while crystalline polymer includes poly (cyclooctene) and poly(ethylene-co-vinyl acetate). [14][15][16][17][18][19][20][21][22][23][24][25][26] On the other hand, Liquid crystalline elastomer was a remarkable invention by Mather et al, who showed that these materials could undergo nematic to isotropic liquid crystalline transition (rather than a T g or T m ) that provided the molecular switching motion to the network. 27,28 As cooling below the nematic/isotropic transition does not involve the vitrification of the entire network, the material remains flexible both in its "temporary" and "permanent" shape, thereby enabling it to be employed in various actuation applications.…”

Section: Introduction 1| Introduction To Shape Memory Polymers and It...mentioning

confidence: 99%

Styrene‐butadiene‐styrene‐based shape memory polymers: Evolution and the current state of art

Basak

Bandyopadhyay

2022

Polymers for Advanced Techs

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Styrene butadiene styrene (SBS) block copolymers comprise of two phases structured domains involving polystyrene "hard" domains and butadiene "soft" domains.The styreneic domains provide a physical crosslink that enables SBS to behave like a highly flexible thermoplastic elastomer. Recently, with the rise of smart elastomers, SBS-based matrices are being extensively used in transforming them into elastomers that can exhibit shape change when excited with a range of stimuli (shape memory elastomers). With the advantages of long-range elasticity, reprocessability, and ability to be modified into various tailor-made shape morphing elastomers, the use SBSbased elastomers has exceptionally risen in the scope of deployable structures temperature sensors, snap fittings, and actuators. This review attempts to tether the recent development in SBS-based shape memory polymers along with highlighting the fabrication routes and the shape memory mechanistic pathway. The review introduces the concept of shape memory polymers, classification, and their characterization, followed by shape memory elastomers and finally one way/two-way SBS-based shape memory elastomers. In an attempt to blend both the scientific and the engineering realm, the narrative provides a concise overview of SBS-based shape morphing polymers' expanding boundaries.

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“…Other polymeric systems, such as poly(cyclooctene), have been examined with an elastocaloric response of ∆T + = 2.8 K at 300% strain. 18 Polyvinylidene difluoride (PVDF) and related co-and terpolymers are notable multi-caloric materials. A 1.8 K elastocaloric temperature change was observed in PVDF across a broad range of temperatures (300-350 K) when subject to an applied stress of 15 MPa.…”

Section: Introductionmentioning

confidence: 99%

Elastocaloric effect in amorphous polymer networks undergoing mechanotropic phase transitions

Koch,

Herman,

White

2021

Preprint

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Deformations of amorphous polymer networks prepared with significant concentrations of liquid crystalline mesogens have been recently reported to undergo mechanotropic phase transitions. Here, we report that these mechanotropic phase transitions are accompanied by an elastocaloric response (∆T = 2.9 K). Applied uniaxial strain to the elastomeric polymer network transitions the organization of the material from a disordered, amorphous state (order parameter Q = 0) to the nematic phase (Q = 0.47). Both the magnitude of the elastocaloric temperature change and mechanically induced order parameter are dependent on the concentration of liquid crystal mesogens in the material. While the observed temperature changes in these materials are smaller than those observed in shape memory alloys, the responsivity, defined as the temperature change divided by the input stress, is larger by an order of magnitude.

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Characterization and modeling of elastocaloric effects of shape memory poly(cyclooctene)

Cited by 9 publications

References 23 publications

Elastocaloric effect of shape memory polymers in elastic response regime

Elastocaloric effect of shape memory polymers in elastic response regime

Styrene‐butadiene‐styrene‐based shape memory polymers: Evolution and the current state of art

Elastocaloric effect in amorphous polymer networks undergoing mechanotropic phase transitions

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