Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

• Published in: Journal of materials science 2014-11, Vol.49 (21), p.7529-7538
• Main Authors: Qadeer, M. I., Savage, S. J., Gedde, U. W., Hedenqvist, M. S.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Damping; Dynamic mechanical properties; Dynamic mechanical property; Elastic moduli; Filler particles; Fillers; Glass transition temperature; Magnetic properties; Magnets; Materials Science; Mechanical properties; Methyltrimethoxysilane; Original Paper; Particulate composites; Permanent magnets; Polyamide resins; Polymer based composite; Polymer matrix composites; Polymer Sciences; Polymer-bonded magnets; Polymers; Rheological properties; Rheological property; Rheology; Silanes; Solid Mechanics; Storage modulus; Surface layers; Surface treatment; Thin surface layer; Trimethoxysilane
• ISSN: 0022-2461; 1573-4803; 1573-4803
• DOI: 10.1007/s10853-014-8460-4

The rheological and dynamic mechanical properties of polymer-based composites of Sm 2 Co 17 and polyamide-12 with different particle loadings, sizes, and surface treatments are reported. Sm 2 Co 17 particles were surface-treated with three different silanes: 3-glycidoxy(propyl)trimethoxysilane, 3-amino(propyl)trimethoxysilane (APTMS), and methyltrimethoxysilane (MTMS). It was shown, for the composites with untreated particles, that the viscosity and storage modulus increased with increasing filler content (0–60 vol%) and decreasing filler particle size. In addition, the glass transition temperature increased significantly and the damping decreased with increasing filler content. Of the silanes, the MTMS, which yielded only a thin surface layer, had in general the least effect on the rheological properties of the composite. The composite containing the APTMS-coated filler showed the highest storage modulus. The results give new insights on how to prepare polymer-bonded magnets with optimal process conditions (rheology) and dynamic mechanical properties, by varying the amount of particles, their size, and surface treatment.