Thermoresponsive Shape-Memory Aerogels from Thiol–Ene Networks

Michal, Brian T.; Brenn, William Alexander; Nguyen, Baochau N.; McCorkle, Linda; Meador, Mary Ann B.; Rowan, Stuart J.

doi:10.1021/acs.chemmater.6b00474

Cited by 44 publications

(34 citation statements)

References 44 publications

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“…Shape‐memory materials, which have been widely used in the field of drug delivery system and aerospace, are one kind of smart materials that have the functionality to keep a temporary shape, and can recover to their original shape under an external stimulation, such as water stimulation, heat stimulation, light stimulation, electrical stimulation, and so on …”

Section: Resultsmentioning

confidence: 99%

Recyclable, shape‐memory, and self‐healing soy oil‐based polyurethane crosslinked by a thermoreversible Diels–Alder reaction

Zheng

Tian

Fan

et al. 2017

J of Applied Polymer Sci

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The recyclable, shape-memory, and self-healing soy oil-based polyurethane (S-PU) networks were constructed by the thermoreversible Diels-Alder (DA) reaction between S-PU (sealed with furfuryl alcohol) and 1,5-bis(maleimido)-2-methylpentane. The DA and retro-DA reactions between furan and maleimide were investigated by Fourier transform infrared spectroscopy, differential scanning calorimetry, solubility, and recycle testing. Moreover, the shape-memory properties of the S-PU networks were studied by qualitative recovery testing and quantitative cyclic tensile testing. Furthermore, the self-healing properties of S-PU networks were confirmed by cut, scratch, and tensile testing. The results showed that, compared to the traditional S-PU, the novel S-PU prepared in this work was recyclable and self-healing. And although both of them have shape-memory effect, the novel S-PU has a higher shape fixed rate and shape recovered rate than the traditional S-PU.

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Section: Resultsmentioning

confidence: 99%

Recyclable, shape‐memory, and self‐healing soy oil‐based polyurethane crosslinked by a thermoreversible Diels–Alder reaction

Zheng

Tian

Fan

et al. 2017

J of Applied Polymer Sci

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“…Die Vereinigung der Zellen und die mangelnde Integrität der Zellwände führen bei der Blowing‐Methode oft zu einer makroporösen, offenen Zellstruktur. Ein sehr gutes Beispiel für einen Schwamm mit größtenteils offener Zellstruktur ergab eine PP/PTFE‐Mischung, die durch einen Extrusionsprozess mit CO 2 gewonnen wurde . Interessanterweise konnte die Aufnahmerate von Benzinen oder organischen Flüssigkeiten dieser Schwämme mit zusätzlicher Ultraschallbehandlung signifikant verändert werden.…”

Section: Methoden Zur Herstellung Makroporöser Schwämmeunclassified

“…In Abhängigkeit von der Trocknungsmethode (Verdunstung, atmosphärische oder überkritische Trocknung) wird der Sol‐Gel‐Prozess (Abbildung a) größtenteils zur Herstellung von Schwämmen als Monolithe, Aerogele, Ambigele oder Xerogele eingesetzt. Abbildung b zeigt vier typische Beispiele für 3D‐Thiol‐En‐Netzwerke, ligninbasierte Xerogele, CNT‐Schwämme und Graphen/Kohlenstoff‐Aerogele . Xerogele und Ambigele können ihre Form während des Trocknens wegen der schwachen Netzstruktur verlieren und stark schrumpfen, wohingegen Aerogele eine höhere Formstabilität aufweisen.…”

Section: Methoden Zur Herstellung Makroporöser Schwämmeunclassified

“…Beispiel einer 3D‐Struktur unter Einsatz des Sol‐Gel‐Prozesses: b) Thiol‐En‐Netzwerke (Wiedergabe mit Genehmigung aus Lit. , Copyright 2016, American Chemical Society), c) ligninbasierte Xerogele (Wiedergabe mit Genehmigung aus Lit. , Copyright 2014, American Chemical Society), d) CNT‐Schwämme (Wiedergabe mit Genehmigung aus Lit.…”

Section: Methoden Zur Herstellung Makroporöser Schwämmeunclassified

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Offenzellige Schwämme mit niedrigen Dichten als Funktionsmaterialien

2017

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Makroporöse Schwämme sind eine Chance und Herausforderung für die Chemie und Materialwissenschaften. Die Herausforderung liegt in der Herstellung der Schwämme, die bestimmte Eigenschaftskombinationen aufweisen und zu neuen Anwendungen führen. Kennzeichnend für derartige Schwämme sind geringes Gewicht, Atmungsaktivität, spezielle Benetzungseigenschaften, großer Massentransfer, mechanische Stabilität und große Porenvolumina. Bottom‐up‐ und Top‐down‐Methoden zur Herstellung von Schwämmen aus Kohlenstoff und Polymeren sowie ausgewählte Eigenschaften und mögliche Anwendungen werden in diesem Aufsatz diskutiert.

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“…However, to the best of our knowledge, there have been very few reports about shape memory aerogels . Rowan and coworkers developed a thermal responsive shape memory aerogel from a thiol‐ene network with a glass temperature above room temperature, and showed that it displays very good shape memory performance. However, this shape memory aerogel is produced from an organogel.…”

Section: Compressive Properties and Shape Memory Performance Of The Cmentioning

confidence: 99%

Fabrication of Shape‐Memory Aerogel Based on Chitosan/Poly(ethylene glycol) Diacrylate Semi‐Interpenetrating Networks via a Facile and Eco‐Friendly Strategy

Xiao

et al. 2019

Macro Materials & Eng

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exhibit strong advantages in providing diverse mechanical properties, such as varying from stiff to high elasticity to enable adaption to a wide range of demands.While the application of aerogels in smart materials has attracted increasing attention, ensuring full functionality in a porous structure is still highly challenging. As one of the booming smart materials, shape-memory polymers (SMPs) have been intensively investigated, and numerous multiresponsive, [20][21][22][23][24][25] multifunctional shape memory polymeric bulk materials [26][27][28][29] or hydrogels [30][31][32][33][34][35] have been developed. However, to the best of our knowledge, there have been very few reports about shape memory aerogels. [36,37] Rowan and coworkers [38] developed a thermal responsive shape memory aerogel from a thiol-ene network with a glass temperature above room temperature, and showed that it displays very good shape memory performance. However, this shape memory aerogel is produced from an organogel. Generally, fabricating aerogels from hydrogels is a more economical and eco-friendly strategy.Herein, we seek to develop a shape memory polymeric aerogel (SMPA) from the corresponding hydrogel via an eco-friendly strategy by choosing water soluble and highly matchable constituent materials. It is well-known that crystalline poly(ethylene glycol) (PEG) with a melting temperature (T m ) above room temperature is a favorable component for the development of thermally induced SMPs, and its water solubility makes it a good candidate for SMPA. However, the aerogel formed from a single highly crystalline PEG component will show a poor mechanical performance. To address this problem, we considered chitosan (CS) which is a biobased material derived from sustainable resources. CS is obtained by deacetylation of chitin and its physicochemical properties are determined by the degree of deacetylation and molecular weight. [39] It was identified as a good start material for fabricating aerogels with unique advantages, such as good flexibility, nontoxicity, cost-effectiveness and biodegradability. Thus, CS was chosen as the other precursor material to enhance the aerogel skeleton. In this work, we prepared a shape memory aerogel based on chitosan/poly(ethylene glycol) diacrylate (CS/PEGDA) semi-interpenetrating networks (semi-IPNs) via a facile one-pot photocrosslinking approach. The feed ratio of CS and diacrylic PEG (PEGDA) precursors with different molecular weights were tuned to Shape-Memory Aerogels While the field of shape memory polymers (SMPs) has developed rapidly, it is still highly challenging to obtain SMPs in the form of aerogels (SMPAs) due to the unique technique used for the fabrication of the aerogels and their high porosity. Herein, a thermally induced SMPA based on chitosan/poly(ethylene glycol) diacrylate (CS/PEGDA) semi-interpenetrating networks is reported that are produced using an eco-friendly strategy. The main network is responsible for the shape memory effect (SME) and can be easily tuned by varying the feed rat...

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Thermoresponsive Shape-Memory Aerogels from Thiol–Ene Networks

Cited by 44 publications

References 44 publications

Recyclable, shape‐memory, and self‐healing soy oil‐based polyurethane crosslinked by a thermoreversible Diels–Alder reaction

Recyclable, shape‐memory, and self‐healing soy oil‐based polyurethane crosslinked by a thermoreversible Diels–Alder reaction

Offenzellige Schwämme mit niedrigen Dichten als Funktionsmaterialien

Fabrication of Shape‐Memory Aerogel Based on Chitosan/Poly(ethylene glycol) Diacrylate Semi‐Interpenetrating Networks via a Facile and Eco‐Friendly Strategy

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