Electromagnetic Activation of Shape Memory Polymer Networks Containing Magnetic Nanoparticles

Schmidt, Annette

doi:10.1002/marc.200600225

Cited by 453 publications

(301 citation statements)

References 37 publications

(34 reference statements)

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“…The value of T m could be tuned by the peroxide crosslinking and boehmite nanofillers content yielding a temperature interval between 37 and 51°C, which is close to the body temperature [24]. Schmidt [25] produced thermosets from oligomeric #-caprolactone dimethacrylate and butyl acrylate by peroxide crosslinking. Into the network Fe 3 O 4 nanoparticles were also embedded to trigger the SM function by electromagnetic activation.…”

Section: Chemical Networkmentioning

confidence: 99%

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Karger‐Kocsis

Kéki

2014

Express Polym. Lett.

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Shape memory (SM) biodegradable polymers (SMPs) and related composites are emerging smart materials in different applications. SMPs may adopt one (dual-shape), two (triple-shape) or several (multishape) stable temporary shapes and recover their permanent shape (or other temporary shapes in case of multi-shape versions) upon the action of an external stimulus. The external stimulus may be temperature, pH, water, light irradiation, redox condition etc. In most cases, however, the SMPs are thermally activated. The 'switching' or transformation temperature (T trans ), enabling the material to return to its permanent shape, is either linked with the glass transition (T g ) or with the melting temperature (T m ).Thus, SMPs are often subdivided based on their switch types into T g -or T m -based SMPs. As reversible 'switches' other mechanisms such as liquid crystallization and related transitions, supermolecular assembly/disassembly, irradiation-induced reversible network formation, formation and disruption of a percolation network, may also serve [1]. The permanent shape is guaranteed by physical or chemical network structures. The latter may be both on molecular and supramolecular levels. Linkages of these networks are termed net points. The temporary shape is created by mechanical deformation above T trans . In some cases the deformation temperature may be below Abstract. Shape memory polymers (SMPs) are capable of memorizing one or more temporary shapes and recovering to the permanent shape upon an external stimulus that is usually heat. Biodegradable polymers are an emerging family within the SMPs. This minireview delivers an overlook on actual concepts of molecular and supramolecular architectures which are followed to tailor the shape memory (SM) properties of biodegradable polyesters. Because the underlying switching mechanisms of SM actions is either related to the glass transition (T g ) or melting temperatures (T m ), the related SMPs are classified as T g -or T m -activated ones. For fixing of the permanent shape various physical and chemical networks serve, which were also introduced and discussed. Beside of the structure developments in one-way, also those in two-way SM polyesters were considered. Adjustment of the switching temperature to that of the human body, acceleration of the shape recovery, enhancement of the recovery stress, controlled degradation, and recycling aspects were concluded as main targets for the future development of SM systems with biodegradable polyesters.

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Section: Chemical Networkmentioning

confidence: 99%

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Karger‐Kocsis

Kéki

2014

Express Polym. Lett.

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“…In general, the polymer's shape memory (SM) effect is described and evaluated in a thermo-temporal SM cycle, where the SMP is firstly deformed at a high temperature (usually above the glass transition or melting point) and subsequently frozen upon cooling to fix the programmed temporary shape. When an environmental stimulus is applied, the SMP could either provide recovery stresses or return to their permanent shapes, depending on whether or not the external loads still exist, namely the constrained or free recovery condition [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] . Since SMPs can sense the environmental changes and then take reactions in a predetermined sequence with deformation, they are considered as a promising alternative for the future's spontaneous shape changing and tunable components in various applications such as microelectromechanical systems, surface patterning, biomedical devices, aerospace deployable structures and morphing structures [31][32][33][34][35][36][37][38][39] .…”

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confidence: 99%

Reduced time as a unified parameter determining fixity and free recovery of shape memory polymers

2014

Nat Commun

214

176

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Shape memory polymers are at the forefront of recent materials research. Although the basic concept has been known for decades, recent advances in the research of shape memory polymers demand a unified approach to predict the shape memory performance under different thermo-temporal conditions. Here we report such an approach to predict the shape fixity and free recovery of thermo-rheologically simple shape memory polymers. The results show that the influence of programming conditions to free recovery can be unified by a reduced programming time that uniquely determines shape fixity, which consequently uniquely determines the shape recovery with a reduced recovery time. Furthermore, using the time-temperature superposition principle, shape recoveries under different thermo-temporal conditions can be extracted from the shape recovery under the reduced recovery time. Finally, a shape memory performance map is constructed based on a few simple standard polymer rheology tests to characterize the shape memory performance of the polymer.

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“…For example, a SMPU that can sustain shape recovery even at −30 o C has been reported. 13 An electroactive shape memory polymer composite containing carbon nanotube, 14,15 electromagnetic filler, 16,17 Ni chain, 18,19 have been already reported, demonstrating a quick shape recovery according to the application of electric current or electromagnetic field. In line with the above functional polymers, three well known fluorescent dyes, rhodamine, methylene violet, or fluorescein, were grafted to SMPU chain in this investigation to synthesize various fluorescent SMPUs as chemosensors.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Fluorescent Shape Memory Polyurethanes Grafted with Various Dyes

Chung¹,

Choi²,

Lee³

et al. 2011

Bulletin of the Korean Chemical Society

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Shape memory polyurethane (SMPU), grafted with a fluorescent dye (Rhodamine, Mehylene violet, or Fluorescein) through an allophanate linking, was tested for the fluorescence and the shape recovery effect. The main chain of SMPU was composed of 4,4'-methylenebis(phenylisocyanate) (MDI), poly(tetramethyleneglycol) (PTMG), and 1,4-butanediol (BD), and a fluorescent dye was connected through a second MDI linked to the carbamate moiety of the main chain. Three series of SMPU, differing according to their dye content, were prepared to compare their shape recovery and fluorescence properties. In tensile mechanical property, maximum stress increased up to 350% compared to the linear SMPU, and strain remained above 2000%. Shape recovery went to as high as 97%, and remained almost same after repetitive shape recovery test cycles. Finally, the fluorescence emission of SMPU was demonstrated in the luminescence spectrum and fluorescent light emission pictures. In addition, the response of SMPU to external stimuli such as metal ions was investigated.

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Electromagnetic Activation of Shape Memory Polymer Networks Containing Magnetic Nanoparticles

Cited by 453 publications

References 37 publications

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Reduced time as a unified parameter determining fixity and free recovery of shape memory polymers

Investigation of Fluorescent Shape Memory Polyurethanes Grafted with Various Dyes

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