ACTIVITY OF FILLERS IN UNCONVENTIONAL POLYMER NETWORKS

The behaviour of fillers (carbon black, precipitated silica, ZnO and C aCO3) in rubber crosslinked conventionally or with ionic and complex c rosslinks was studied. Use of monoallyl maleate as a coagent of peroxi de vulcanisation of EPM in presence of alkaline fillers leads to forma tion of crosslinks with ionic structure. Zinc chloride added to NBR fo rms complex crosslinks with participation of nitrile groups, which act as ligands. It is shown that the strongest reinforcing effect had fil lers in vulcanizates containing ionic crosslinks, particularly if ZnO and CaCO3 were used. It is established that the activity of ZnO is als o rather high in ZnCl2-containing NBR vulcanizates; the behaviour of s ilica and carbon black is less dependent on the structure of crosslink s.