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Preparation and characterization of polystyrene‐based magnetic nanocomposites. Thermal, mechanical and magnetic properties
Author(s) -
López Daniel,
Cendoya Ione,
Torres Francesc,
Tejada Javier,
Mijangos Carmen
Publication year - 2001
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10881
Subject(s) - materials science , polystyrene , nanocomposite , thermal stability , composite material , polymer , glass transition , characterization (materials science) , chemical engineering , nanotechnology , engineering
In this paper we report results on both material preparation and characterization of a polystyrene‐based magnetic nanocomposite material. CoFe 2 0 4 mineralized sulfonated polystyrene was prepared by in‐situ precipitation and oxidation of Co +2 and Fe +2 within a sulfonated polystyrene resin. The magnetic oxide particles of nanometer size were characterized by wide angle X‐ray diffraction (WAXD). Polystyrene‐based composite films were obtained by dispersion of the finely milled mineralized resin in a polystyrene matrix from the melt state (compositions ranging from 0 to 50 wt% of mineralized resin). The thermal and mechanical properties of the nanocomposite films were determined by TGA, DSC, and stress‐strain testing. The magnetic characterization of the samples was also performed. No significant changes in thermal stability, glass transition temperature or mechanical properties of the polystyrene matrix occur as a consequence of the content in mineralized resin. These results show that the filler acts as aninert diluent for the polymer matrix. On the other hand, the magnetic characterization of the samples reveals the presence of nanoparticles with diameters ranging from 3 to 8 nm, showing, at room temperature, coercive field values of around 800 Oe and saturation magnetization between 120 and 420 emu/g. The combination of these properties suggests the use of these systems in the preparation of magnetic recording materials with high recording density.