Influence of molecular properties of SSBR and BR types on composite performance

Modern passenger car tire tread compounds usually consist of a polymer blend Solution Styrene-Butadiene Rubber (SSBR) and Butadiene (BR) in combination with silica/silane system. To further enhance the compatibility between nonpolar polar silica, different functional groups can be introduced at end or along chains. The influence such functionalization SSBR BR on processing behavior as well mechanical dynamic properties was investigated for silica-filled model compounds. Silica-filled functionalized SPRINTAN™ SLR 4602 blended non-functionalized 363H 884 L three ratios: 90/10, 80/20 70/30. two BRs differ five analytical properties: molecular weight, vinyl content, cis-content, glass transition temperature (Tg) functionalization. All composite way. is dominating influencing parameter this study. presence improves rubber-filler-interaction. This leads to better compound: reinforcement index increased tan δ 60 °C, lab predictor rolling resistance, reduced while 0 wet grip, similar BR. Furthermore, Tg whole compound dominates dynamic-mechanical behavior, expected. In case BR, has δ, effect plays minor role. These new insights support development polymers improve overall performance.