Thermo‐responsive shape memory behavior of poly(styrene‐b‐isoprene‐b‐styrene)/ethylene‐1‐octene copolymer thermoplastic elastomer blends

Tekay, Emre

doi:10.1002/pat.5139

Cited by 20 publications

(17 citation statements)

References 43 publications

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“…[49][50][51] Molecular architecture or molecular deformation mechanism, is another essential factor in achieving shape memory behavior. 52,53 The molecular architecture of SMEs must consist of net-points (the hard phase or fixed phase) and switching units (the soft phase or reversible phase), which allow the structure to be deformed, maintained, and recovered under applied force and external activation. 54,55 Recently, Chien et al 56…”

Section: Overviews Of Smesmentioning

confidence: 99%

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

Prathumrat

Nikzad

Hajizadeh

et al. 2022

Polymers for Advanced Techs

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Shape memory elastomers (SMEs) are a class of intelligent materials characterized by their ability to deform and recover shapes under applied force and external stimuli. Heat and ultraviolet radiation are examples of the most common external stimuli. With the emerging prevalence of internet of things devices and the ensuing need for smart materials and structures, SMEs provide significant opportunities to support the development of novel applications in robotics, remotely actuated systems, and packages, including those promised for the space industry. To harness the immense potential in the emerging applications of these materials, one approach is the systematic multi‐scale modeling coupled with artificial intelligence‐assisted design leading to the development of next‐generation intelligent systems. This review covers several aspects of the synthesis/materials chemistry and applications of SMEs with a view towards enabling such an approach. The synthesis procedures emphasizing dynamic covalent bond reactions are reviewed. Then, liquid crystalline elastomers are introduced as a specific elastomeric material class that exhibits excellent shape memory characteristics and distinctive transition temperatures. The utilization of advanced manufacturing methods such as additive manufacturing, three‐dimensional printing, and the emerging four‐dimensional printing technologies assisted by machine learning are detailed in producing and predicting SMEs. Finally, the current trends in the use of SMEs are summarized in areas of industrial and space engineering and biomedical applications.

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Section: Overviews Of Smesmentioning

confidence: 99%

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

Prathumrat

Nikzad

Hajizadeh

et al. 2022

Polymers for Advanced Techs

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“…[97] It has been shown that blending a small crystalline molecule such as a fatty acid or paraffin wax to the elastomer can form SMPs as the crystalline domains can form a thermally responsive solid network (Figure 6). [92,[98][99][100] The strategy allows decoupling of the elastomer network, and a fixing network (small crystalline molecule) and has been applied to fabricate SMPs from a range of polyolefins, including sulfonated EPDM polystyrene/polydiene block copolymers and polyolefin block copolymers. The trigger temperature of these SMPs [101][102][103] can be varied easily by varying the content of the incorporated crystalline moieties.…”

Section: Shape Memory Semicrystalline Elastomers and Designing Them T...mentioning

confidence: 99%

Section: Shape Memory Semicrystalline Elastomers and Designing Them T...mentioning

confidence: 99%

Two‐Way Semicrystalline Shape Memory Elastomers: Development and Current Research Trends

Basak

Bandyopadhyay

2022

Adv Eng Mater

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Two‐way shape memory polymers (SMPs) have gained significant attention in the recent past owing to their ability to spontaneously and reversibly switch between two different shapes when heated and cooled, thereby allowing them to reversibly actuate autonomously. Semicrystalline elastomers are one of the best classes to design two‐way SMPs owing to the crystallization‐induced elongation and the melting‐induced contraction that can result in reversible strain in the elastomeric network and can be applied to fabricate artificial muscles and actuators. This review revisits the overview of the SMPs and the inspiration behind developing two‐way shape memory semicrystalline elastomers and their mechanistic pathway. Finally, the latest developments in the realm of the elastomeric networks and how these smart materials are gaining spotlight along with the future purview and potential outlook are circumscribed.

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“…Shape memory polymers (SMPs) are a type of intelligent material that can be fixed with a temporary shape and recover to a permanent shape in response to external stimuli 1 such as temperature, 2,3 light, 4 electricity, 5,6 magnetic field, 7 and solvens 8,9 . SMPs have many advantages such as large deformation, a wide range of stimulation methods, easy processing, easy modification, low cost, and corrosion resistance 10 .…”

Section: Introductionmentioning

confidence: 99%

Stress‐free two‐way shape memory property and microstructure evolution of single‐phase polymer networks

Hao

Yue

Zhou

et al. 2022

Polymers for Advanced Techs

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In this work, single‐phase polymer networks with excellent stress‐free two‐way shape memory effect (2W‐SME) were successfully fabricated based on poly(ethylene‐co‐vinyl acetate) (EVA) and dicumyl peroxide. The microstructural evolution during actuation was repeatable and reversible, as demonstrated by the in situ wide‐angle X‐ray scattering. During multiple heating and cooling cycles, the (110) and (200) reflections of EVA appeared with increasing intensity, and the orientation degree was high at the low temperature point (10°C), suggesting that the oriented crystallites are present throughout the entire sample and hold extended conformation of the polymer strands in the amorphous phase. When heating to a high temperature (Thigh = 70°C), partial melting of crystallites leads to the contraction of the material, and the intensity of the (110) and (200) reflections and the orientation became smaller, indicating that the residual oriented crystallites could still provide an anisotropic skeleton for the oriented recrystallization of the amorphous molecular chain. Moreover, the reversible actuation strain showed a maximum value of 15.6% at a Thigh of 72°C and was present even at a Thigh of 80°C when the polymer had a very small crystalline fraction (2.2%). Considering the remarkable stress‐free 2W‐SME, EVA may have potential applications in smart grippers, actuators, and sensors.

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Thermo‐responsive shape memory behavior of poly(styrene‐b‐isoprene‐b‐styrene)/ethylene‐1‐octene copolymer thermoplastic elastomer blends

Cited by 20 publications

References 43 publications

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

Two‐Way Semicrystalline Shape Memory Elastomers: Development and Current Research Trends

Stress‐free two‐way shape memory property and microstructure evolution of single‐phase polymer networks

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