Pressure molding (10 atm, 1 min, 110°) of mixts. of graphite or polyacetylene and 1,4-trans-polybutadiene (1:10 wt. ratio) gives mech. firm sheets that become conductive after intercalation with I (10 and 100 S cm-1, resp.). Crosslinking of the material via electron beam irradn. after intercalation leads to immediate loss of cond. Intercalation of I is impeded after beam treatment of the blends.