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Tailoring the recovery force in magnetic shape-memory nanocomposites

Published online by Cambridge University Press:  16 September 2013

M. Behl ,
M.Y. Razzaq  and
A. Lendlein
M. Behl
Affiliation:
Institute for Biomaterial Science and Berlin Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513 Teltow, Germany
M.Y. Razzaq
Affiliation:
Institute for Biomaterial Science and Berlin Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513 Teltow, Germany
A. Lendlein
Affiliation:
Institute for Biomaterial Science and Berlin Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513 Teltow, Germany
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Abstract

Composites from magnetic nanoparticles in a shape-memory polymer (SMP) matrix allow a remote actuation of the shape-memory effect by exposure to alternating magnetic fields. At the same time the incorporation of MNP may affect the thermal properties and the structural functions of the SMP.

Here, we explored the adjustability of the recovery force as an important structural function in magnetic shape-memory nanocomposites (mSMC) by variation of the programing temperature (Tprog) and nanoparticle weight content. The nanocomposites were prepared by coextrusion of silica coated magnetite nanoparticles (mNP) with an amorphous polyether urethane (PEU) matrix. In tensile tests in which Tprog was varied between 25 and 70 °C and the particle content from 0 to 10 wt% it was found that the Young’s moduli (E) decreased with temperature and particle content. Cyclic, thermomechanical experiments with a recovery module under strain-control conditions were performed to monitor the effect of mNP and Tprog on the recovery force of the composites. During the strain-control recovery the maximum stress (σm,r) at a characteristic temperature (Tσ,max) was recorded. By increasing the mNP content from 0 to 10 wt% in composites, σm,r of 1.9 MPa was decreased to 1.25 MPa at a Tprog = 25 °C. A similar decrease in σm,r for nanocomposites with different mNP content could be observed when Tprog was increased from 25 °C to 70 °C. It can be concluded that the lower the deformation temperature and the particle content the higher is the recovery force.

Keywords

polymercompositeelastic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1569: Symposium NN – Advanced Materials for Biological and Biomedical Applications , 2013 , pp. 129 - 134
Copyright
Copyright © Materials Research Society 2013 

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References

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