Macromol. Chem. Phys. 5/2013

Julich‐Gruner, Konstanze K.; Löwenberg, Candy; Neffe, Axel T.; Behl, Marc; Lendlein, Andreas

doi:10.1002/macp.201370016

Cited by 24 publications

(33 citation statements)

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“…Because of these factors, to achieve a high shape recovery ratio ( R r > 90%), the programming strain of thermoplastic polymers typically does not exceed 400% . In contrast, shape‐memory polymers (SMPs) based on covalent networks have shown high shape recovery ratios but exhibit a limited elastic deformation capacity . Furthermore, many applications for biomedical devices require large shape changes as the devices need to be inserted through small incisions or in a minimally invasive way by the usage of catheters, and subsequently need to recover their original, application relevant shape.…”

Section: Introductionmentioning

confidence: 99%

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Mazurek-Budzyńska

Razzaq

Tomczyk

et al. 2016

Polymers for Advanced Techs

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A challenge in the design of shape‐memory polymers (SMPs) is to achieve high deformability with a simultaneous high shape recovery ratio. Here we explored, whether SMPs featuring large deformation capability and high shape recovery ratios can be created as polymer networks providing two kinds of netpoints based on covalent bonds and physical interactions. As a model system, we selected poly(carbonate‐urea‐urethane)s (PCUUs) synthesized by a precursor route, based on oligo(alkylene carbonate) diols, isophorone diisocyanate (IPDI), and water vapor. The PCUU networks exhibited a one‐way shape‐memory effect (1W‐SME) with programmed strains up to εprog = 1000% whereby they provided excellent shape fixity (92–97%) and shape recovery (≥99%) ratios. The switching temperatures (Tsw) varied between 36 and 65 °C and increased with the increasing molecular weight of the oligo(alkylene carbonate) diol and length of the hydrocarbon chain between the carbonate linkages. Tsw was also influenced by the strain applied during programming (εprog). Poly(carbonate‐urethane)s have been reported to have good biocompatibility and biostability, which in the combination of high‐strain capacity and high Young's modulus makes the obtained PCUUs interesting candidate materials suitable for medical devices such as medical sutures or vascular stents. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Mazurek-Budzyńska

Razzaq

Tomczyk

et al. 2016

Polymers for Advanced Techs

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“…Figure 1 B shows the resulting triangle-shaped hydrogel, panel 1, and the pH-stimulated switchable transition from the shaped Shape-memory polymers represent an interesting class of smart materials processed into a permanent shape that is programmed into a temporary shape that stores the code to recover, in the presence of an appropriate stimulus, to the original shape. [1][2][3][4][5] The applications of shape-memory polymers as sensors, controlled drug release matrices, [ 6,7 ] actuators of microdevices, [8][9][10] and functional materials for inscription of information have been suggested. [11][12][13][14][15][16] For example, thermoresponsive matrices, exhibiting temperature-controlled phase transitions that dictate the shape and properties of the polymer, represent an important class of organic shape-memory polymers.…”

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confidence: 99%

pH‐Stimulated DNA Hydrogels Exhibiting Shape‐Memory Properties

et al. 2014

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Nucleic acid-functionalized polyacrylamide chains that are cooperatively cross-linked by i-motif and nucleic acid duplex units yield, at pH 5.0, DNA hydrogels exhibiting shape-memory properties. Separation of the i-motif units at pH 8.0 dissolves the hydrogel into a quasi-liquid phase. The residual duplex units provide, however, a memory code in the quasi-liquid allowing the regeneration of the hydrogel shape at pH 5.0.

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“…In particular, materials that show shape memory behavior have a sensitive response (change of shape) to external stimuli such as temperature, pH, humidity, light and electricity. Among the shape memory materials, thermoresponsive polymers have gained enormous attention because of their good processability, low cost and high recovery ability at relatively low temperature . They are capable of fixing a transient shape and recovering their original dimensions when heated above a switching temperature, T switch .…”

Section: Functional Properties and Applicationsmentioning

confidence: 99%

Recent developments in plant oil based functional materials

Mosiewicki

Aranguren

2015

Polymer International

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The increasing interest of academic and industrial sectors in the use of bio‐based materials mirrors the overwhelming need for replacing, as much as possible, petroleum derived chemicals, reducing the negative environmental impact derived from their usage. Vegetable oils fulfill this goal extremely well, because of their worldwide availability, large volume production at comparatively low prices and versatility of the modifications and reactions in which they can participate to produce a large variety of different monomers and polymer precursors. Further reactions of these chemicals can lead to very different types of final materials with varied applications. It is because of this remarkable versatility that many review articles have appeared during the last few years; many of them have dealt with the various routes for vegetable oil modification and options for polymer synthesis, whilst others were dedicated to the analysis of the properties of the derived materials, generally focusing on structural properties. In this review, we focus on the capabilities of vegetable oils to be modified and/or reacted to obtain materials with functional properties suitable for use in coatings, conductive or insulating materials, biomedical, shape memory, self‐healing and thermoreversible materials as well as other special functional applications. © 2015 Society of Chemical Industry

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Macromol. Chem. Phys. 5/2013

Cited by 24 publications

References 0 publications

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

pH‐Stimulated DNA Hydrogels Exhibiting Shape‐Memory Properties

Recent developments in plant oil based functional materials

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