Nanocomposites based on nanostructured PI-b-PMMA copolymer and selectively placed PMMA-modified magnetic nanoparticles: Morphological and magnetic characterization
Ikusi/ Ireki
Data
2016-02Egilea
Barandiaran Olaetxea, Irati
Grana, Eftychia
Katsigiannopoulos, Dimitrios
Avgeropoulos, Apostolos
Kortaberria Altzerreka, Galder
European Polymer Journal 75 : 514-524 (2016)
Laburpena
Hybrid organic/inorganic nanocomposites with magnetic properties have been prepared,
based on nanostructured PI-b-PMMA block copolymer and selectively placed magnetic
Fe2O3 nanoparticles. Magnetic nanoparticles have been functionalized with PMMA brushes
by atom transfer radical polymerization in order to increase the compatibility with the
PMMA block of the copolymer. The success of nanoparticle modification has been probed
by infrared spectroscopy and thermogravimetric analysis. Morphological characterization
of the neat block copolymer and the nanocomposites has been studied by small-angle
X-ray scattering and atomic force microscopy measurements. For as cast films of nanocomposites,
the surface perpendicular lamellar nanostructure was altered with the nanoparticle
addition, and a morphology consisting on a mixture of surface parallel and
perpendicular lamellae was formed for low nanoparticle amount, while for higher
nanoparticle content some cylindrical domains were observed. For films annealed by solvent
vapors, the cylindrical morphology of the neat copolymer thin film was maintained
for low nanoparticle content, while the ordered morphology was disrupted for the highest
nanofiller content. Magnetic characterization by vibrating sample magnetometer and
superconducting quantum interference device has demonstrated that magnetic properties
of nanoparticles have been transferred to the nanocomposites, exhibiting superparamagnetic
behavior similar to that of the maghemite nanoparticles at room temperature.