Elastomeric magnetic composites - physical properties and network structure

The two types of magnetic elastomeric composites were prepared by incorporation of ferrite alone as well as ferrite in combinations with carbon black in rubber matrix based on natural rubber. The influence of applied fillers and thermo-oxidative ageing on basic physical and magnetic properties of elastomeric composites was studied. Together with the study of properties, the crosslink density and sulfur crosslink structure of prepared vulcanizates were analyzed. The results of the study showed that ferrite alone as well as in combinations with carbon black affects the evaluated properties in various ways. The presence of magnetic filler leads to an increase value of stress at 300 % elongation (S(e300)) and hardness of composites, the elongation at break by contrast decreases. The values of tensile strength practically do not change in the presence of applied filler. The values of magnetic properties of vulcanizates significantly increase with increasing of ferrite content. In generally one can say that prepared vulcanizates have suitable magnetic and elastic properties.