The present paper describes the effect of superconductors on the sintering process, apparent cross-linking density, sintering factor, hardness and volume fraction of butyl rubber (IIR) composites. Electrical conductivity and I–V characteristics at various

Five polymer–metal complexes of iron(II), cobalt(II), nickel(II), copper(II) and zinc(II) were prepared from the reaction of dithiooxamide with metal salts. Elemental analysis, UV–VIS and IR investigations were carried out for the polymer complexes. The temperature variation of the DC electrical conductivity was measured in the range 298–498 K for the five polymer complexes. The proposed mechanism for the variation is based on defects: quasi-particles, solitons and polarons.