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Bidirectional actuation of a thermoplastic polyurethane elastomer

  • Herein, we report on how to teach a thermoplastic polyurethane elastomer completely stress-free, bidirectional motion. Briefly spoken, we applied training, consisting of extensive tensile deformation in the specimen's viscoelastic state, initiating deformation-induced crystallization. Once unloaded, thermo-reversible specimen expansion and contraction could be detected. Following the microstructural evolution of such a trained specimen by in situ wide-angle X-ray scattering gave evidence for progressive growth of oriented crystallites during cooling. Upon heating, crystallite melting resulted in structural disorder. Beyond this, modification of the training method was used to introduce a geometrically more complex crystalline order. Here, actuation in the form of a decrease and an increase in sample thickness and specimen twisting and untwisting were witnessed. The novel semi-crystalline polymer actuator highlights an enormous potential for realizing versatile reversible shape changesHerein, we report on how to teach a thermoplastic polyurethane elastomer completely stress-free, bidirectional motion. Briefly spoken, we applied training, consisting of extensive tensile deformation in the specimen's viscoelastic state, initiating deformation-induced crystallization. Once unloaded, thermo-reversible specimen expansion and contraction could be detected. Following the microstructural evolution of such a trained specimen by in situ wide-angle X-ray scattering gave evidence for progressive growth of oriented crystallites during cooling. Upon heating, crystallite melting resulted in structural disorder. Beyond this, modification of the training method was used to introduce a geometrically more complex crystalline order. Here, actuation in the form of a decrease and an increase in sample thickness and specimen twisting and untwisting were witnessed. The novel semi-crystalline polymer actuator highlights an enormous potential for realizing versatile reversible shape changes in elastomers.zeige mehrzeige weniger

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Metadaten
Autor*innen:Martin Bothe, Thorsten Pretsch
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Eigenverlag BAM
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Journal of materials chemistry A
Jahr der Erstveröffentlichung:2013
Verlag:RSC
Verlagsort:London [u.a.]
Jahrgang/Band:1
Ausgabe/Heft:46
Erste Seite:14491
Letzte Seite:14497
Freie Schlagwörter:Bidrectional actuation; Hermann's orientation function; In situ wide-angle X-ray scattering; Mechanical properties; Microscopic model; Phase change; Poly(1,4-butylene adipate); Poly(ester urethane); Polymorphism; Reversible shape changes; Semi-crystallinity; Shape memory polymer; Stimuli-sensitive polymer; Thermoplastic polyurethane elastomer; Training; Two-way actuator; Two-way shape memory
DOI:10.1039/c3ta13414h
ISSN:2050-7496
ISSN:2050-7488
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:28.11.2013
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