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< Vol. 10 Issue 3 | Sep-Dec 2012 | pp 163 - 314 - Focus on Advanced Functional Polymers for Medicine

Influence of a polyester coating of magnetic nanoparticles on magnetic heating behavior of shape-memory polymer-based composites

Abstract

Background: Magnetic composites of thermosensitive shape-memory polymers (SMPs) and magnetite nanoparticles (MNPs) allow noncontact actuation of the shape-memory effect in an alternating magnetic field. In this study, we investigated whether the magnetic heating capability of cross-linked poly(ε-caprolactone)/MNP composites (cPCLC) could be improved by covalent coating of MNPs with oligo(ε-caprolactone) (OCL). Methods: Two different types of cPCLC containing uncoated and OCL-coated MNP with identical magnetite weight content were prepared by thermally induced polymerization of poly(ε-caprolactone) diisocyanatoethyl methacrylate. Both cPCLCs exhibited a melting transition at Tm = 48°C, which could be used as switching transition. Results: The dispersion of the embedded nanoparticles within the polymer matrix could be substantially improved, when the OCL-coated MNPs were used, as visualized by scanning electron microscopy. We could further demonstrate that in this way the maximal achievable bulk temperature (Tbulk) obtained within the cPCLC test specimen in magnetic heating experiments at a magnetic field strength of H = 30 kA⋅m-1 could be increased from Tbulk = 48°C to Tbulk = 74°C.

J Appl Biomater Funct Mater 2012; 10(3): 203 - 209

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/JABFM.2012.10293

Authors

Li Wang, Matthias Heuchel, Liang Fang, Karl Kratz, Andreas Lendlein

Article History

  • • Accepted on 18/09/2012
  • • Available online on 06/12/2012
  • • Published in print on 13/02/2013

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Authors

  • Wang, Li [PubMed] [Google Scholar]
    Center for Biomaterial Development and Berlin-Brandenburg Centre for Regenerative Therapies, Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Teltow - Germany and Institute of Chemistry, University of Potsdam, Potsdam - Germany
  • Heuchel, Matthias [PubMed] [Google Scholar]
    Center for Biomaterial Development and Berlin-Brandenburg Centre for Regenerative Therapies, Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Teltow - Germany
  • Fang, Liang [PubMed] [Google Scholar]
    Center for Biomaterial Development and Berlin-Brandenburg Centre for Regenerative Therapies, Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Teltow - Germany
  • Kratz, Karl [PubMed] [Google Scholar]
    Center for Biomaterial Development and Berlin-Brandenburg Centre for Regenerative Therapies, Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Teltow - Germany
  • Lendlein, Andreas [PubMed] [Google Scholar]
    Center for Biomaterial Development and Berlin-Brandenburg Centre for Regenerative Therapies, Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Teltow - Germany and Institute of Chemistry, University of Potsdam, Potsdam - Germany

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