NEODYMIUM-BASED POLYBUTADIENE OF IMPROVED COLD-RESISTANCE

Abstract

The difference in the frost resistance of butadiene rubbers produced on neodymium (BR-Nd) and titanium (BR-Ti) catalytic systems due to their difference in the crystallization ability (C) is considered. C was evaluated by differential scanning calorimetry (DSC). DSC thermograms were obtained under cooling by DSC204 F1 Phoenix device. Reduction C was achieved by changing the structure of macromolecules during post-polymerization modification. The rubber modified with a polyfunctional heterocyclic compound (HC) was used in model rubber mixture. The results were compared with the rubber obtained using tin tetrachloride (SnCl₄) as a modifier. At almost the same glass transition temperature of these rubbers, the coefficient of frost resistance of rubbers at –45 °C with the HC modification is higher than with the SnCl₄ modification (0,5 instead of 0,3). The effectiveness of HC was confirmed by reduction C as well as improving physical and mechanical parameters at processing properties at the level of BR-Ti.