Some novel polyamines as antioxidants for SBR vulcanizates

Styrene-butadiene rubber (SBR) mixtures containing poly(o-toluidine), poly( m-toluidine) and poly(2-amino pyridine) have been prepared. The rheometric characteristics of the compounded rubber and the physico-mechanical propert ies of the vulcanizates were determined. The effects of the prepared polyme rs on the ageing characteristics of corresponding vulcanizates were evaluat ed. The efficiency of the polymers was correlated with their chemical struc ture. It was found that the synthesized compounds show good antioxidant beh avior compared with the conventional agent (P beta N) industrially used, an d the efficiency of such compounds depends on their chemical structure. (C) 1999 Elsevier Science Ltd. All rights reserved.