Excellent triple-shape memory effect and superior recovery stress of ethylene-vinyl acetate copolymer fiber

Qi, Xiaoming; Dong, Yubing; Islam, Md. Zahidul; Zhu, Yaofeng; Fu, Yaqin; Fu, Shao‐Yun

doi:10.1016/j.compscitech.2020.108609

Cited by 38 publications

(9 citation statements)

References 50 publications

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“…DesmoW2.2/DesmoW3 achieve values of 39.00/28.84 MPa, 2.29/1.89 MPa, and 5.87/6.55%, respectively. These values are comparable to values in the literature of SMP fibers, which range between 1–3 MPa [ 28 , 29 ]. The programming stress for wet-spun yarns is more than doubled, owing to the high surface roughness and filament interlinks.…”

Section: Discussionsupporting

confidence: 89%

Influence of Spinning Method on Shape Memory Effect of Thermoplastic Polyurethane Yarns

et al. 2023

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Shape memory polymers are gaining increasing attention, especially in the medical field, due to their ability to recover high deformations, low activation temperatures, and relatively high actuation stress. Furthermore, shape memory polymers can be applied as fiber-based solutions for the development of smart devices used in many fields, e.g., industry 4.0, medicine, and skill learning. These kind of applications require sensors, actors, and conductive structures. Textile structures address these applications by meeting requirements such as being flexible, adaptable, and wearable. In this work, the influence of spinning methods and parameters on the effect of shape memory polymer yarns was investigated, comparing melt and wet spinning. It is shown that the spinning method can significantly influence the strain fixation and generated stress during the activation of the shape memory effect. Furthermore, for wet spinning, the draw ratio could affect the stress conversion, influencing its efficiency. Therefore, the selection of the spinning process is essential for the setting of application-specific shape-changing properties.

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Section: Discussionsupporting

confidence: 89%

Influence of Spinning Method on Shape Memory Effect of Thermoplastic Polyurethane Yarns

et al. 2023

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“…The recovery stress is determined by the stored entropic energy in the network being controlled by the density and strength of network junctions . The multiple H-bonding cross-linked network possessing the adjustable strong and weak segments is able to increase high steric hindrance or intermolecular interactions to increase the density and strength of network junctions and balance the conflict between strength and toughness to ensure large recoverable strain . Therefore, the pre-stretched film possesses more high energy output to lift weight.…”

Section: Resultsmentioning

confidence: 99%

Humidity-Responsive Shape Memory Polyurea with a High Energy Output Based on Reversible Cross-Linked Networks

Leng

2022

ACS Appl. Mater. Interfaces

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High-performance shape memory polymers with multifunctions are essential in sensors, wearable flexible electronics, artificial muscle actuators, and reversible morphing structures. In this work, a transparent and humidity-responsive shape memory polyurea featuring a high tensile strength (51 MPa), a high recovery stress (12 MPa) with an high energy output (0.98 J/g), and tolerance to extreme environments (retains great malleability at −196 °C) is prepared through constructing a bioinspired hard−soft nanophase structure and through hierarchical hydrogen bonding in the molecular network. The hard segment of a strong hydrogen bonding region is in charge of humidity-responsive behavior, and the soft segment of a weak bonding region provides the flexibility of the molecular chain. Furthermore, the periodicity of the phase-separated domains is 12 nm as characterized by small-angle X-ray scattering. The hydrogen bonding cross-linked network can be opened under the action of stress and re-bonded by heating, just like a zipper structure of reversible linking property. This unique molecular structure contributes to the humidity-responsive behavior of polyurea rolling up 160°in 20 s on the palm, as well as a high energy output lifting a 100 g weight exceeding 1631 times its own mass to 60 mm. The molecular structure of the hard−soft nanophase and the hierarchical hydrogen bonding offer an effective approach toward achieving a high-performance shape memory polymer with humidity-sensitive functions.

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“…Generally, shape memory composites are made up of shape memory fibers. Recently, Fu et al reported the remarkable shape memory effect of EVA fibers (vinyl acetate content of 18%) by regulating the crystalline structure transformations through control of the thermomechanical coupling conditions. , EVA fibers could be remolded into various temporary shapes at deformation temperatures ( T d ) within and above T m . It was found that the shape recovery process of EVA fibers relied on orientation, crystalline phase transition, and conformational relaxation.…”

Section: Smart Functional Polyolefinsmentioning

confidence: 99%

Section: Smart Functional Polyolefinsmentioning

confidence: 99%

Tailor-Made Functional Polyolefins of Complex Architectures: Recent Advances, Applications, and Prospects

2022

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Polyolefins play a crucial role in the polymer industry because of their low-cost monomers and well-established production processes. Recent years have witnessed tremendous progress in direct and tandem copolymerization strategies that provide an opportunity of developing polyolefins bearing polar groups with distinctive architectures and properties. In this perspective, we first highlight new routes for the proficient synthesis of tailor-made functional polyolefins and briefly discuss their designing tactics. Then, we attempt to categorize these, recently appeared in the literature, innovative functional polyolefins on the basis of their applications. The prospected future applications of polar olefin copolymers include biomedical materials, catalysts, energy storage devices, and conductive polymers, which open up new arenas and paradigms for academic research and industrial products development. Critical issues concerning intelligent functional polyolefins and green chemistry are discussed, too.

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Excellent triple-shape memory effect and superior recovery stress of ethylene-vinyl acetate copolymer fiber

Cited by 38 publications

References 50 publications

Influence of Spinning Method on Shape Memory Effect of Thermoplastic Polyurethane Yarns

Influence of Spinning Method on Shape Memory Effect of Thermoplastic Polyurethane Yarns

Humidity-Responsive Shape Memory Polyurea with a High Energy Output Based on Reversible Cross-Linked Networks

Tailor-Made Functional Polyolefins of Complex Architectures: Recent Advances, Applications, and Prospects

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