Abstract
Rubber magnetic composites were prepared by incorporation of barium ferrite in constant amount—50 phr into acrylonitrile-butadiene rubber. Dicumyl peroxide as the curing agent was used for cross-linking of rubber magnets alone, or in combination with four different types of co-agents. The main aim was to examine the influence of curing system composition on magnetic and physical-mechanical properties of composites. The cross-link density and the structure of the formed cross-links were investigated too. The results demonstrated that the type and amount of the co-agent had significant influence on cross-link density, which was reflected in typical change of physical-mechanical properties. The tensile strength increased with increasing amount of co-agents, which can be attributed to the improvement of adhesion and compatibility on the interphase filler-rubber due to the presence of co-agents. Magnetic characteristics were found not to be influenced by the curing system composition. The application of peroxide curing systems consisting of organic peroxide and co-agents leads to the preparation of rubber magnets with not only good magnetic properties but also with improved physical-mechanical properties, which could broaden the sphere of their application uses.
Highlights
Composites based on rubber matrix and various types of magnetic fillers, the so-called rubber magnetic composites, have been recognized as class of smart materials which are already found to have utilization in microwave and radar technology, motor parts, vibration absorbers, variable impedance surfaces, sensors of magnetic and electromagnetic fields, memory devices, inductor cores, and other technological applications [1, 2]
Sulfur and peroxide curing systems are still the most widely used for cross-linking of rubber matrices
Vulcanization with sulfur is a complex process leading to the formation of different types of sulfidic cross-links between rubber chains (monosulfidic C-S-C, disulfidic C-S2-C, and polysulfidic cross-links C-Sx-C (x 3–6))
Summary
Vulcanization, often termed as curing, is one of the most important processes in rubber technologies. During this process, plastics rubber compound changes into highly elastic final product—vulcanizate. Is leads to the creation of three-dimensional network structure within the rubber matrix, by reactions between the functional groups of rubber chains and suitable curing agents. Sulfur and peroxide curing systems are still the most widely used for cross-linking of rubber matrices. Vulcanization with sulfur is a complex process leading to the formation of different types of sulfidic cross-links between rubber chains (monosulfidic C-S-C, disulfidic C-S2-C, and polysulfidic cross-links C-Sx-C (x 3–6)). Sulfur-cured vulcanizates exhibit good tensile properties, high tensile and tear strength, good dynamic characteristics, or good abrasion resistance. Sulfur-cured vulcanizates exhibit good tensile properties, high tensile and tear strength, good dynamic characteristics, or good abrasion resistance. e main negatives are poor resistance to thermooxidative ageing and weak stability at high temperatures [3, 4]
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