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Barium ferrite in constant amount (50 phr) was incorporated into styrene-butadiene rubber to prepare rubber magnetic composites. Dicumyl peroxide was used as a curing agent for cross-linking of the prepared composites. Four different types of low-molecular-weight organic compounds were applied as coagents to enhance the efficiency of cross-linking process and to improve the compatibility between the rubber and the filler on the interphase. The main goal of this work was to investigate the influence of the composition of peroxide curing system on cross-link density, physical–mechanical and magnetic properties of the composites. The results revealed that the type and amount of coagents have no influence on magnetic properties of the rubber magnets. On the other hand, cross-link density and physical–mechanical properties were significantly dependent on the composition of curing system. The increase of tensile strength can be attributed to the improvement of adhesion on the interphase filler–rubber due to the presence of coagents. [ABSTRACT FROM AUTHOR]

Thanks to their good magnetic properties, NiZn ferrites can be used as the soft magnetic filler in magneto–polymer composites. The ferrites having general composition NixZn1-xFe2O4 (x=0.30, 0.33, 0.36, 0.42, and 0.50) were prepared by means of ceramic method and the magnetic properties, such as initial permeability \mui and Curie temperature TC were investigated. The sample with composition Ni0.33Zn0.67Fe2O4 having \mui=1316 and TC=95\ ^{\circ}C was chosen as the filler for magneto–polymer composites. The aim of the work was the study of preparation and properties of magnetic polymer composites based on natural rubber SMR 20 in a wide range of concentrations (0–600 phr). The influence of ferrite content on magnetic, physical–mechanical and rheological properties of prepared composites was investigated. The effect of the concentration of ferrite filler on the complex permeability \mu=\mu^\prime-j\mu^\prime\prime of the composites in the frequency range from 10 MHz to 3 GHz as well as the physical–mechanical and rheological properties is evident. [ABSTRACT FROM AUTHOR]

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