Aging effect on the reflectivity measurements of polychloroprene matrices containing carbon black and carbonyl-iron powder

摘要

The effect of aging, arising from salt spray exposure, on the microwave reflectivity was studied for polychloroprene (CR) matri- ces, containing different kinds of active material in particulate form. The materials used as microwave absorbers in different con- tents were carbon black (CB) and carbonyl-iron powder (CIP). The microwave reflectivities were determined for the frequency range of 8-16 GHz. The formation of a superficial layer of iron oxide on CIP:CR composites was responsible for a reduction and change of microwave absorption towards a higher frequency. The reflectivity curves of CB:CR composites did not display any significant difference before and after the exposure.