Shape‐Memory Hydrogels with Switching Segments Based on Oligo(ω‐pentadecalactone)

Medientyp: E-Artikel
Titel: Shape‐Memory Hydrogels with Switching Segments Based on Oligo(ω‐pentadecalactone)
Beteiligte: Balk, Maria; Behl, Marc; Nöchel, Ulrich; Lendlein, Andreas
Erschienen: Wiley, 2012
Erschienen in: Macromolecular Materials and Engineering
Umfang: 1184-1192
Sprache: Englisch
DOI: 10.1002/mame.201200232
ISSN: 1439-2054; 1438-7492
Schlagwörter: Materials Chemistry ; Polymers and Plastics ; Organic Chemistry ; General Chemical Engineering
Zusammenfassung: <jats:title>Abstract</jats:title><jats:p>We investigated whether dual‐shape hydrogels based on crosslinked <jats:italic>N</jats:italic>‐vinyl‐2‐pyrrolidone can be created, in which oligo(<jats:italic>ω</jats:italic>‐pentadecalactone) (<jats:styled-content>$\overline {M} _{{\rm n}} $<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-1.gif" xlink:title="equation image" /></jats:styled-content> = 2900 g · mol<jats:sup>−1</jats:sup>, <jats:italic>T</jats:italic><jats:sub>m</jats:sub> = 89 °C) chain segments contribute to the switching domains. In the obtained hydrogels, the volumetric degree of swelling decreased from 480 to 190% while the <jats:italic>E</jats:italic>‐moduli increased from 0.10 to 0.34 MPa with increasing OPDL content. Furthermore, the equilibrium swollen hydrogels displayed good shape‐memory properties with strain fixity ratios above 95% and strain recovery rates above 92%. These shape‐memory hydrogels, whose degree of swelling was almost independent of the temperature, might be interesting candidates for various applications such as stimuli‐sensitive switches or valves. <jats:boxed-text content-type="graphic" position="anchor"><jats:graphic xmlns:xlink="http://www.w3.org/1999/xlink" mimetype="image/jpeg" position="anchor" specific-use="enlarged-web-image" xlink:href="graphic/mgra001.jpg"><jats:alt-text>magnified image</jats:alt-text></jats:graphic></jats:boxed-text></jats:p>
Beschreibung: <jats:title>Abstract</jats:title><jats:p>We investigated whether dual‐shape hydrogels based on crosslinked <jats:italic>N</jats:italic>‐vinyl‐2‐pyrrolidone can be created, in which oligo(<jats:italic>ω</jats:italic>‐pentadecalactone) (<jats:styled-content>$\overline {M} _{{\rm n}} $<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-1.gif" xlink:title="equation image" /></jats:styled-content> = 2900 g · mol<jats:sup>−1</jats:sup>, <jats:italic>T</jats:italic><jats:sub>m</jats:sub> = 89 °C) chain segments contribute to the switching domains. In the obtained hydrogels, the volumetric degree of swelling decreased from 480 to 190% while the <jats:italic>E</jats:italic>‐moduli increased from 0.10 to 0.34 MPa with increasing OPDL content. Furthermore, the equilibrium swollen hydrogels displayed good shape‐memory properties with strain fixity ratios above 95% and strain recovery rates above 92%. These shape‐memory hydrogels, whose degree of swelling was almost independent of the temperature, might be interesting candidates for various applications such as stimuli‐sensitive switches or valves. <jats:boxed-text content-type="graphic" position="anchor"><jats:graphic xmlns:xlink="http://www.w3.org/1999/xlink" mimetype="image/jpeg" position="anchor" specific-use="enlarged-web-image" xlink:href="graphic/mgra001.jpg"><jats:alt-text>magnified image</jats:alt-text></jats:graphic></jats:boxed-text></jats:p>
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