Recent advances in polymer shape memory

Xie, Tao

doi:10.1016/j.polymer.2011.08.003

Cited by 795 publications

(715 citation statements)

References 84 publications

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“…); light (photo-responsive, without apparent temperature fluctuation); and, mechanical force (mechano-responsive, including impact and pressure) [2][3][4][5][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Figurementioning

confidence: 99%

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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Abstract:This review paper summarizes the recent research progress in the underlying mechanisms behind the shape memory effect (SME) and some newly discovered shape memory phenomena in polymeric materials. It is revealed that most polymeric materials, if not all, intrinsically have the thermo/chemo-responsive SME. It is demonstrated that a good understanding of the fundamentals behind various types of shape memory phenomena in polymeric materials is not only useful in design/synthesis of new polymeric shape memory materials (SMMs) with tailored performance, but also helpful in optimization of the existing ones, and thus remarkably widens the application field of polymeric SMMs.

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Section: Figurementioning

confidence: 99%

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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“…moisture, pH). [1][2][3] The simplest type of SMP is formed from amorphous polymer. In this case the SMP is created by heating the material to a temperature above the glass transition temperature (Tg), inducing molecular chain orientation by stretching it, and then freezing in the orientation by cooling.…”

Section: Introductionmentioning

confidence: 99%

“…Similar macroscopic physical behaviour can be accomplished for both amorphous and semicrystalline polymer, and in either case this shape change ability can be categorised as a shape memory effect (SME). 1,2,4 If an amorphous SMP, having been stretched into its oriented state ("programmed"), is then heated above Tg while restrained, a restrained shrinkage stress will be generated. Restrained shrinkage stresses observed in unmodified SMPs generally range from a few tenths of a megapascal (MPa) to a few tens of MPa, depending on the material and programming regime used.…”

Section: Introductionmentioning

confidence: 99%

“…Restrained shrinkage stresses observed in unmodified SMPs generally range from a few tenths of a megapascal (MPa) to a few tens of MPa, depending on the material and programming regime used. 2,5,6 A key parameter which determines the final stress achieved is the temperature at which the SMP has been programmed, and the maximum value for the stress upon reheating generally occurs at or near the programming temperature initially used. 3,7 The restrained shrinkage stress also depends upon the programming strain and strain rate.…”

Section: Introductionmentioning

confidence: 99%

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Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Teall

Pilegis

Sweeney

et al. 2017

Smart Mater. Struct.

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The shrinkage force exerted by restrained shape memory polymers can potentially be used to close cracks in structural concrete. This paper describes the physical processing and experimental work undertaken to develop high shrinkage die-drawn Polyethylene Terephthalate (PET) shape memory polymer tendons for use within a crack closure system. The extrusion and die-drawing procedure used to manufacture a series of PET tendon samples is described. The results from a set of restrained shrinkage tests, undertaken at differing activation temperatures, are also presented along with the mechanical properties of the most promising samples.The stress developed within the tendons is found to be related to the activation temperature, the cross-sectional area and to the draw rate used during manufacture. Comparisons with commercially-available PET strip samples used in previous research are made, demonstrating an increase in restrained shrinkage stress by a factor of two for manufactured PET filament samples.

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“…Bonding is performed while the phase-changing material is melted; thus, the adhesive has the compliance of the thin membrane to generate large contact area, but once solidified in this deformed shape the compliance is decreased dramatically thus ensuring strong peel resistance. SMPs are a class of material that can perform a similar function, though without undergoing phase change [16][17][18]. An SMP has a cross-linking network that sets its permanent shape, determined during its initial curing stage.…”

Section: Introductionmentioning

confidence: 99%

An Internally Heated Shape Memory Polymer Dry Adhesive

Eisenhaure

Kim

2014

Polymers

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A conductive epoxy-based shape memory polymer (SMP) is demonstrated using carbon black (CB) as a dopant for the purpose of creating an SMP dry adhesive system which can internally generate the heat required for activation. The electrical and mechanical properties of the CB/SMP blends for varying dopant concentrations are characterized. A composite adhesive is created to minimize surface contact resistance to conductive tape acting as electrodes, while maintaining bulk resistivity required for heat generation due to current flow. The final adhesive can function on flat or curved surfaces. As a demonstration, a 25 mm wide by 45 mm long dry adhesive strip is shown to heat evenly from an applied voltage, and can easily hold a mass in excess of 6 kg when bonded to a spherical concave glass surface using light pressure at 75 °C.

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Recent advances in polymer shape memory

Cited by 795 publications

References 84 publications

Mechanisms of the Shape Memory Effect in Polymeric Materials

Mechanisms of the Shape Memory Effect in Polymeric Materials

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

An Internally Heated Shape Memory Polymer Dry Adhesive

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