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  4. Highly Shrinkable Objects as Obtained from 4D Printing
 
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2022
Journal Article
Title

Highly Shrinkable Objects as Obtained from 4D Printing

Abstract
4D printing of shape memory polymers enables the production of thermoresponsive objects. In this contribution, a facile printing strategy is followed for an in-house synthesized thermoplastic poly(ether urethane). Processing by means of fused filament fabrication, in which the difference between nozzle temperature and material-specific glass transition temperature of the polymer is kept as low as possible, allows to obtain highly shrinkable objects whose shape and thermoresponsiveness can be precisely controlled. The effectiveness of the method also applies to the printing material polylactic acid. One possible application lies in highly shrinkable objects for assembly purposes. As proof-of-concept, lightweight hands-free door openers for healthcare applications are functionally simulated and developed. Once printed, such devices shrink when heated to fit on door handles, allowing an easy assembly. At the end-of-use, a heating-initiated disassembling and mechanical recycling are proposed. In perspective, a reuse of the materials in 4D printing can contribute to the emergence of a circular economy for such highly functional materials.
Author(s)
Chalissery, Dilip  
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Schönfeld, Dennis  
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Walter, Mario  
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Shklyar, Inga  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Andrä, Heiko  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Schwörer, Christoph  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Amann, Tobias  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Weisheit, Linda  
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Pretsch, Thorsten  
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Journal
Macromolecular materials and engineering  
Funder
Fraunhofer-Gesellschaft FhG
Bundesministerium für Bildung und Forschung BMBF (Deutschland)  
Open Access
DOI
10.1002/mame.202100619
Additional full text version
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Language
English
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Keyword(s)
  • 4D printing

  • additive manufacturing

  • shape memory polymer

  • device design

  • mechanical property

  • Healthcare

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