Elastic Shape Memory Hybrids Programmable at Around Body-Temperature for Comfort Fitting

Wang, Tao Xi; Renata, Chris; Chen, Hong Mei; Huang, Wei Min

doi:10.3390/polym9120674

Cited by 18 publications

(19 citation statements)

References 36 publications

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“…Programming a polymer based on the melting transition can be done either in the melting temperature range (or above) upon heating or in the crystallization temperature range (or above) upon cooling (after pre-heating). Hence, in the case of, for instance, comfort fitting in direct contact with human body [ 38 , 39 ], we are able to programme the polymer investigated in Section 2 at body temperature or even room temperature without worrying of being either too hot or short of time in programming (fitting), which are problems in those polymers in which the glass transition is utilized in programming.…”

Section: Applications Of Vitrimer-like Smps and Their Compositesmentioning

confidence: 99%

Vitrimer-Like Shape Memory Polymers: Characterization and Applications in Reshaping and Manufacturing

et al. 2020

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The shape memory effect (SME) refers to the ability of a material to recover its original shape, but only in the presence of a right stimulus. Most polymers, either thermo-plastic or thermoset, can have the SME, although the actual shape memory performance varies according to the exact material and how the material is processed. Vitrimer, which is between thermoset and thermo-plastic, is featured by the reversible cross-linking. Vitrimer-like shape memory polymers (SMPs) combine the vitrimer-like behavior (associated with dissociative covalent adaptable networks) and SME, and can be utilized to achieve many novel functions that are difficult to be realized by conventional polymers. In the first part of this paper, a commercial polymer is used to demonstrate how to characterize the vitrimer-like behavior based on the heating-responsive SME. In the second part, a series of cases are presented to reveal the potential applications of vitrimer-like SMPs and their composites. It is concluded that the vitrimer-like feature not only enables many new ways in reshaping polymers, but also can bring forward new approaches in manufacturing, such as, rapid 3D printing in solid state on space/air/sea missions.

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Section: Applications Of Vitrimer-like Smps and Their Compositesmentioning

confidence: 99%

Vitrimer-Like Shape Memory Polymers: Characterization and Applications in Reshaping and Manufacturing

et al. 2020

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“…Mullins effect and Payne effect, etc. in rubber-like elastic polymers are also ignored [82,83,84,85]. From application point of view, film and thin sheet should be more convenient in many sensor applications, such as SMP based anti-counterfeit labels reported in References [86,87,88] and Figure 5.…”

Section: Typical Sensor Applicationsmentioning

confidence: 99%

“…Since silicone is elastic and the piece of RFID is placed in the middle of the tag (neutral plane), the tag is flexible for bending, but it is designed to be neither stretchable nor twistable, as both types of deformation trend to break the embedded RFID. By replacing elastic silicone with highly elastic SMP [84,85] and inducing wrinkles [65] in the piece of embedded RFID, the tag in Figure 12I(a) becomes stretchable. In Figure 12II, the stress vs. strain relationship in cyclic stretching of a piece of stretchable tag is presented.…”

Section: Typical Sensor Applicationsmentioning

confidence: 99%

A Brief Review of the Shape Memory Phenomena in Polymers and Their Typical Sensor Applications

et al. 2019

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In this brief review, an introduction of the underlying mechanisms for the shape memory effect (SME) and various shape memory phenomena in polymers is presented first. After that, a summary of typical applications in sensors based on either heating or wetting activated shape recovery using largely commercial engineering polymers, which are programmed by means of in-plane pre-deformation (load applied in the length/width direction) or out-of-plane pre-deformation (load applied in the thickness direction), is presented. As demonstrated by a number of examples, many low-cost engineering polymers are well suited to, for instance, anti-counterfeit and over-heating/wetting monitoring applications via visual sensation and/or tactual sensation, and many existing technologies and products (e.g., holography, 3D printing, nano-imprinting, electro-spinning, lenticular lens, Fresnel lens, QR/bar code, Moiré pattern, FRID, structural coloring, etc.) can be integrated with the shape memory feature.

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“…For these reasons, SMPs have attracted considerable attention in the past decade. So far, SMEs in both thermoset and thermoplastic polymers have been reported in the literature and many engineering polymers have been shown to have intrinsically superior shape memory performance [ 10 , 33 , 34 , 35 , 36 , 37 , 38 ]. In the case of foam materials, many foamed polymers (such as polyurethane (PU) [ 39 ], epoxy [ 40 ], ethylene-vinyl acetate copolymer (EVA) [ 41 ], etc.)…”

Section: Introductionmentioning

confidence: 99%

Thermo-Responsive Shape Memory Effect and Conversion of Porous Structure in a Polyvinyl Chloride Foam

et al. 2020

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In this paper, a thermo-responsive shape memory effect in a polyvinyl chloride thermoset foam is characterized. Excellent shape recovery performance is observed in foam samples programmed both at room temperature and above their transition temperature. The conversion of porous structures in the foam from closed-cell to open-cell after a shape memory effect cycle is revealed via a series of specially designed oil-dripping experiments and optical images of the micro pores. Programming the strain higher than 20% results in an apparent increase in open-cell level, whereas programming temperatures have almost no influence.

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Elastic Shape Memory Hybrids Programmable at Around Body-Temperature for Comfort Fitting

Cited by 18 publications

References 36 publications

Vitrimer-Like Shape Memory Polymers: Characterization and Applications in Reshaping and Manufacturing

Vitrimer-Like Shape Memory Polymers: Characterization and Applications in Reshaping and Manufacturing

A Brief Review of the Shape Memory Phenomena in Polymers and Their Typical Sensor Applications

Thermo-Responsive Shape Memory Effect and Conversion of Porous Structure in a Polyvinyl Chloride Foam

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