Thermomechanical Behavior of a Polyurethane Shape Memory Polymer Foam

Huang, Wei; Lee, Chee-Wei; Teo, Hui-En

doi:10.1177/1045389x06055768

Cited by 97 publications

(36 citation statements)

References 13 publications

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“…It would be expected that the anisotropy ratio affects shape memory behavior as well. Polyurethane foams are the first and most studied foams for their shape memory properties [11][12][13], although the effect of the foam structure anisotropy on the shape memory behavior has been never investigated.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Behavior of PET Foams

2018

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Shape memory properties of PET (polyethylene-terephthalate) foams have been evaluated for two different foam densities. Samples were subjected to multiple memory-recovery cycles along three different directions to measure the effect of foam anisotropy on static mechanical and shape memory properties. The memory cycle was performed by uniaxial compression tests at room temperature. Despite these severe conditions, PET foams demonstrated very good shape memory behavior with shape recovery always higher than 90%. Due to cycling, the mechanical performance of foam samples is partially reduced, mainly along the extrusion direction of the foam panels. Despite this loss of static performance, shape memory properties are only partially affected by thermo-mechanical cycles. The maximum reduction is 10% for shape fixity and 3% for shape recovery. The experimental results are particularly interesting considering that compression tests were undertaken at room temperature. Indeed, PET foams seem to be optimal candidates for self-repairing structures.

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Section: Introductionmentioning

confidence: 99%

Shape Memory Behavior of PET Foams

2018

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“…SMF have a very low density, are highly compressible and possess a significant shape recovery ratio that is very desirable for various applications, specifically in aerospace and automotive industries 12,15 . With SMFs, polymeric vehicles or structures could in theory be compacted during transportation and returned back to their original shape when delivered, significantly reducing the storage required for transportation 11 .…”

Section: Introductionmentioning

confidence: 99%

“…The first shape memory foam was proposed by Tey et al 10 , using SMP core material in a open cell structure. Typical constituent solids for SMFs are epoxy 11,12 , polyurethane 13 and vinyl copolymer-based polymers 14 . SMF have a very low density, are highly compressible and possess a significant shape recovery ratio that is very desirable for various applications, specifically in aerospace and automotive industries 12,15 .…”

Section: Introductionmentioning

confidence: 99%

Blocked Shape Memory Effect in Negative Poisson’s Ratio Polymer Metamaterials

Boba

Bianchi

McCombe

et al. 2016

ACS Appl. Mater. Interfaces

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We describe a new class of negative Poisson's ratio (NPR) open cell PU-PE foams produced by blocking the shape memory effect in the polymer. Contrary to classical NPR open cell thermoset and thermoplastic foams that return to their auxetic phase after reheating (and therefore limit their use in technological applications), this new class of cellular solids has a permanent negative Poisson's ratio behavior, generated through multiple shape memory (mSM) treatments that lead to a fixity of the topology of the cell foam. The mSM-NPR foams have Poisson's ratio values similar to the auxetic foams prior their return to the conventional phase, but compressive stress-strain curves similar to the ones of conventional foams. The results show that by manipulating the shape memory effect in polymer microstructures it is possible to obtain new classes of materials with unusual deformation mechanisms.2

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“…7,8 Regarding chemical composition, polymers such as acrylamides, 9 acrylates, 10 caprolactones, 11 and polyurethanes 12 have been proved useful as stimuli-sensitive polymers with advanced functionalities. Their interest derives from their application, for example, as self-deployable sun-sails, heat-shrinkable tubes for electric isolation, microfoldable vehicles and microtags, 13,14 to number a few.…”

Section: Introductionmentioning

confidence: 99%

Shape-memory effect for self-healing and biodegradable photonic systems

Espinha

Serrano

Blanco

et al. 2014

Photonic Crystal Materials and Devices XI

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Photonic systems with the capability to respond to different stimuli are more and more desirable for achieving multifunctionality and higher levels of performance. They demand materials with responsivity that may eventually be used for integrating sensing and actuating functions, a feature highly pursued in technological applications. A notable property which is being gradually incorporated in this kind of multifunctional materials is the shape memory effect (SME). In this work, a material system consisting of a two-dimensional photonic crystal (PC) imprinted in the surface of a shape memory polymer (SMP) is reported. It integrates several interesting features such as elasticity, thermoresponsivity and shape memory. The referred PC is composed of a hexagonal lattice of nanobowls, transferred to the SMP surface using replica molding. Good quality and large extensions of PC were achieved. Differential scanning calorimetry studies confirmed a melting transition responsible for the SME in these materials. From the structural point of view, their surfaces were characterized by atomic force and scanning electron microscopies. From the optical point of view, the characterization of the first order Bragg diffraction angle was carried out. A full programmable character of the structures, derived from the SME, was demonstrated. The reported material system presents some interesting additional features. In particular, the SMP selected for replicating the PC belongs to the family of polydiolcitrates, which are known to be biocompatible and biodegradable elastomers. The PC described herein is thus attractive for the development of disposable devices or for temporal usage in biomedicine or biophotonics.

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Thermomechanical Behavior of a Polyurethane Shape Memory Polymer Foam

Cited by 97 publications

References 13 publications

Shape Memory Behavior of PET Foams

Shape Memory Behavior of PET Foams

Blocked Shape Memory Effect in Negative Poisson’s Ratio Polymer Metamaterials

Shape-memory effect for self-healing and biodegradable photonic systems

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