Superparamagnetic Nanocomposites Based on the Dispersion of Oleic Acid-Stabilized Magnetite Nanoparticles in a Diglycidylether of Bisphenol A-Based Epoxy Matrix: Magnetic Hyperthermia and Shape Memory

Superparamagnetic nanocomposites were obtained by dispersion of oleic acid (OA)-coated magnetite NPs in an epoxy system based on diglycidylether of bisphenol A (DGEBA) modified with OA. Dispersion of conventional oleic acid-stabilized magnetite NPs in a typical epoxy matrix is not possible due to the dissimilar chemical structures of the organic coating and the reactive solvent. However, by modification of a DGEBA-based epoxy with 20 wt % OA, we obtained a suitable reactive solvent to disperse up to at least 8 wt % of OA-stabilized magnetite NPs. A tertiary amine was used to catalyze the epoxy–acid reaction and initiate the homopolymerization of the epoxy excess. Both reactions occurred practically in series, first the epoxy–acid and then the epoxy homopolymerization. It was necessary to complete the first reaction to attain a very good dispersion of magnetite NPs in the reactive solvent previous to the occurrence of the final reaction. Magnetization curves and TEM images revealed a uniform dispersion of ...

[1]  L. Ambrosio,et al.  Poly(caprolactone) based magnetic scaffolds for bone tissue engineering , 2011 .

[2]  Jeffery W. Baur,et al.  Durability Assessment of Styrene- and Epoxy-based Shape-memory Polymer Resins , 2009 .

[3]  Roberto J. J. Williams,et al.  Synthesis of silver nanoparticles coated with OH-functionalized organic groups: dispersion and covalent bonding in epoxy networks. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[4]  Andreas Lendlein,et al.  Progress in actively moving polymers , 2010 .

[5]  H. Gu,et al.  Oleic acid coating on the monodisperse magnetite nanoparticles , 2006 .

[6]  J. Baselga,et al.  Magnetic nanocomposites based on hydrogenated epoxy resin , 2012 .

[7]  P. Oyanguren,et al.  Epoxies Modified by Palmitic Acid: From Hot‐Melt Adhesives to Plasticized Networks , 2005 .

[8]  I. Zucchi,et al.  Shape memory epoxies based on networks with chemical and physical crosslinks , 2011 .

[9]  L. Matějka,et al.  Self-Assembly of Gold Nanoparticles as Colloidal Crystals Induced by Polymerization of Amphiphilic Monomers , 2008 .

[10]  G. Karst,et al.  Thermomechanical Characterization of Shape Memory Polymers , 2009 .

[11]  J. Oh,et al.  Iron oxide-based superparamagnetic polymeric nanomaterials: Design, preparation, and biomedical application , 2011 .

[12]  D. Baldomir,et al.  Effect of Submicrometer Clustering on the Magnetic Properties of Free-Standing Superparamagnetic Nanocomposites , 2008 .

[13]  I. Mondragon,et al.  Local dynamics in epoxy coatings containing iron oxide nanoparticles by dielectric relaxation spectroscopy , 2008 .

[14]  I. Park,et al.  Direct nanoimprinting of metal nanoparticles for nanoscale electronics fabrication. , 2007, Nano letters.

[15]  P. Mather,et al.  Shape Memory Polymer Research , 2009 .

[16]  Ingrid A. Rousseau,et al.  Shape memory epoxy: Composition, structure, properties and shape memory performances , 2010 .

[17]  Nonmonotonic evolution of the blocking temperature in dispersions of superparamagnetic nanoparticles , 2010, 1011.2650.

[18]  M. Reboredo,et al.  Dielectric and magnetic response of Fe3O4/epoxy composites , 2009 .

[19]  Chenjie Xu,et al.  Monodisperse magnetic nanoparticles for biomedical applications , 2006 .

[20]  F. Gao,et al.  Magnetic polymer nanospheres with high and uniform magnetite content , 2005 .

[21]  X. Batlle,et al.  Finite-size effects in fine particles: magnetic and transport properties , 2002 .

[22]  I. Rousseau,et al.  Effect of the Deformation Temperature on the Shape‐Memory Behavior of Epoxy Networks , 2010 .

[23]  J. Pascault,et al.  Epoxy polymers : new materials and innovations , 2010 .

[24]  V. Rotello,et al.  Direct control of the magnetic interaction between iron oxide nanoparticles through dendrimer-mediated self-assembly. , 2005, Journal of the American Chemical Society.

[25]  M. Holt,et al.  Magnetization, micro-x-ray fluorescence, and transmission electron microscopy studies of low concentrations of nanoscale Fe_3O_4 particles in epoxy resin , 2000 .

[26]  Ronald F. Gibson,et al.  A review of recent research on mechanics of multifunctional composite materials and structures , 2010 .

[27]  Chunmiao Han,et al.  Thermal, mechanical and shape memory properties of shape memory epoxy resin , 2010 .

[28]  K. Gall,et al.  Shape-memory polymer networks with Fe3O4 nanoparticles for remote activation , 2009 .

[29]  G. Lachenal,et al.  Near- and mid-infrared spectroscopy studies of an epoxy reactive system , 1996 .

[30]  Yu Xiao,et al.  Shape memory effect of poly(D,L-lactide)/Fe3O4 nanocomposites by inductive heating of magnetite particles. , 2009, Colloids and surfaces. B, Biointerfaces.

[31]  Veronica J. Neiman,et al.  Synthetic bio-actuators and their applications in biomedicine , 2011 .

[32]  Ingrid A. Rousseau,et al.  Facile tailoring of thermal transition temperatures of epoxy shape memory polymers , 2009 .

[33]  A. Lendlein,et al.  Initiation of shape-memory effect by inductive heating of magnetic nanoparticles in thermoplastic polymers. , 2006, Proceedings of the National Academy of Sciences of the United States of America.