Shape Memory Polymers in Textiles

Hu, Jin Lian; J, Lu

doi:10.4028/www.scientific.net/ast.80.30

Cited by 53 publications

(62 citation statements)

References 57 publications

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“…The thermally responsive species is a linear low-density polyethylene (PE) that is compatible with the TPE midblock to ensure strong adhesion along the TPE/PE interface, [24] as illustrated in Figure 1a. The present design fundamentally differs from fibers produced from the pure TPE [25] or other TPEs containing a glassy or crystallizable switching segment [6,26] due to physical separation of the shape-memory attributes across a macroscopic interface.…”

Section: Physical Microfabrication Of Shape-memory Polymer Systems VImentioning

confidence: 99%

Physical Microfabrication of Shape‐Memory Polymer Systems via Bicomponent Fiber Spinning

Tallury

Pourdeyhimi

Pasquinelli

et al. 2016

Macromol. Rapid Commun.

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As emerging technologies continue to require diverse materials capable of exhibiting tunable stimuli-responsiveness, shape-memory materials are of considerable significance because they can change size and/or shape in controllable fashion upon environmental stimulation. Of particular interest, shape-memory polymers (SMPs) have secured a central role in the ongoing development of relatively lightweight and remotely deployable devices that can be further designed with specific surface properties. In the case of thermally-activated SMPs, two functional chemical species must be present to provide (i) an elastic network capable of restoring the SMP to a previous strain state and (ii) switching elements that either lock-in or release a temporary strain at a well-defined thermal transition. While these species are chemically combined into a single macromolecule in most commercially available SMPs, this work establishes that, even though they are physically separated across one or more polymer/polymer interfaces, their shape-memory properties are retained in melt-spun bicomponent fibers. In the present study, we investigate the effects of fiber composition and cross-sectional geometry on both conventional and cold-draw shape memory, and report surprisingly high levels of strain fixity and recovery that generally improve upon strain cycling.

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Section: Physical Microfabrication Of Shape-memory Polymer Systems VImentioning

confidence: 99%

Physical Microfabrication of Shape‐Memory Polymer Systems via Bicomponent Fiber Spinning

Tallury

Pourdeyhimi

Pasquinelli

et al. 2016

Macromol. Rapid Commun.

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“…Shape shifting can also be induced by the effect of magnetic or electrics fields. [1][2][3] The SMPs are capable of responding to a specific external stimulus through macroscopic changes, as it is a direct change in its specific form. This simple effect in polymers gives them the characteristic of "smart materials" for the ability to memorize a specific shape.…”

Section: Introductionmentioning

confidence: 99%

“…[1] These materials are very versatile for the development of new applications such as: implantable biomedical devices, textile applications, aerospace, electroconductive and magnetic compounds. [2][3][4][5] A significant importance of smart materials is their application in the biomedical field where essential restrictions and limitations are required, such as biocompatibility, biodegradability and a glass transition temperature (T g ) similar to body temperature. [5,6] These smart polymers are composed of two main phases, a soft phase which acts maintaining the material transient form, and a hard phase that induces the material to return to its original form.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Study of Shape Memory in Epoxy Resins

Duarte

Guevara

Medina

2017

Macromolecular Symposia

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Shape memory polymers (SMPs) are stimuli‐response materials known for their ability to be actuated from temporary shape into original shape. Because of this unique functionality SMPs are promising materials for diverse applications fields, including smart biomedical devices, aviation, automobile, structures or coatings. In this article, the work has been focused on the chemical modification of an epoxy monomer Bisphenol A diglycidyl ether (DGEBA) which was carried out by using allyl amines as curing agents and a thiol. When both systems Epoxy‐Amine/Tiol‐Ene were photopolymerized, a soft phase is introduced through a thiol‐ene system and a rigid phase is given by the polymerization of the epoxy polymer when it reacts with the curing agent allyl amine. One of the main requirements in SMPs is the presence of soft and rigid phases. The study of the effect of the concentration of three different curing agents, allyl amine type, over the capacity of the conformed polymers to return to their original shape was evaluated. DMA analysis was used to determine the Tg in the polymers, once obtained, the polymers were treated on a hot water bath above 10 °C their Tg, then the evaluation of the memory shape was carried out by two tests, bending and torsion. SMPs were obtained and specimens with 20% of concentration of allyl amine as curing agent showed an improvement in their ability of memory shape with a 99% of recovery.

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“…25 In the case of SMP polyesters, the covalent crosslinking points determine the permanent shape, while the intermolecular hydrophobic interactions behave as the switch structures for fixing the temporary shape, and the switch temperature corresponds to the glass transition temperature (T g ). 26 SMPs can be used widely in many areas such as biomedicine, 27 aerospace, 28 textiles, 29 energy, 30 electronic engineering, 31 civil engineering, 32 and household products. 33 In this work, (co)polyesters made of citric acid and ethylene glycol (EG) and/or PEG have been synthesized.…”

mentioning

confidence: 99%

Synthesis and characterization of new polydiolcitrates with tunable properties

Nuvoli

Alzari

Nuvoli

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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Polydiolcitrates are an emerging class of biocompatible polyesters with a great potential in the field of biomedicine and packaging for food and drug materials. In this work, a new type of (co‐)polydiolcitrates made of citric acid (CA) and ethylene glycol (EG) and/or poly(ethylene glycol) (PEG) is investigated. By varying both the EG/PEG and the CA/diol molar ratios, materials exhibiting very different swelling behavior, mechanical and thermal properties are obtained. In particular, the substitution of EG segments with longer and flexible PEG ones results in an increase in crosslinking density, with remarkable effects on swelling capacity, glass transition temperature, and Young modulus. Moreover, polyesters with CA/diol molar ratio equal to 1:1 exhibit shape memory properties, with full capacity of keeping the temporary shape and high capacity of recovering the original shape. This work demonstrates that the appropriate choice of polyester composition allows modulating the sample properties, that permits to these materials to cover a wide range of possible applications. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 3713–3720

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Shape Memory Polymers in Textiles

Cited by 53 publications

References 57 publications

Physical Microfabrication of Shape‐Memory Polymer Systems via Bicomponent Fiber Spinning

Physical Microfabrication of Shape‐Memory Polymer Systems via Bicomponent Fiber Spinning

Preparation and Study of Shape Memory in Epoxy Resins

Synthesis and characterization of new polydiolcitrates with tunable properties

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