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Solvent-based Fabrication Method for Magnetic, Shape-Memory Nanocomposite Foams

Published online by Cambridge University Press:  15 November 2019

Karola Luetzow,
Thomas Weigel and
Andreas Lendlein
Karola Luetzow
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Teltow, Germany
Thomas Weigel
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Teltow, Germany
Andreas Lendlein*
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Teltow, GermanyInstitute of Chemistry, University of Potsdam, Potsdam, Germany
*
*Correspondence to: Prof. Andreas Lendlein andreas.lendlein@hzg.de
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Abstract

This paper presents shape-memory foams that can be temporarily fixed in their compressed state and be expanded on demand. Highly porous, nanocomposite foams were prepared from a solution of polyetherurethane with suspended nanoparticles (mean aggregate size 90 nm) which have an iron(III) oxide core with a silica shell. The polymer solution with suspended nanoparticles was cooled down to -20 °C in a two-stage process, which was followed by freeze-drying. The average pore size increases with decreasing concentration of nanoparticles from 158 µm to 230 µm while the foam porosity remained constant. After fixation of a temporary form of the nanocomposite foams, shape recovery can be triggered either by heat or by exposure to an alternating magnetic field. Compressed foams showed a recovery rate of up to 76 ± 4% in a thermochamber at 80 °C, and a slightly lower recovery rate of up to 65 ± 4% in a magnetic field.

Keywords

compositefoampolymermagneticshape memory

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Type
Articles
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MRS Advances , Volume 5 , Issue 14-15: Soft Materials and Biomaterials , 2020, pp. 785 - 795
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Copyright
Copyright © Materials Research Society 2019

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