TIN-COUPLED STYRENE-BUTADIENE RUBBERS (SBRS) - RELATIONSHIP BETWEEN COUPLING TYPE AND PROPERTIES

Following the development of new SBRs for tyre applications, several k inds of tin-polymer bonds (styryl-, butadienyl-, isoprenyl- and alpha- methylstyryltin) have been studied, in both branched and linear chains . Dynamic-mechanical properties of the carbon black vulcanizates have been analyzed to establish a relationship between structural parameter s of polymers and compound properties. The filler-polymer interaction parameter, defined by a ratio of mechanical and dynamic terms, has bee n used for the evaluation of the compounds. The introduction of differ ent types of tin-polymer bonds, in branched and linear chains of the S BRs, implies an improvement in the hysteresis properties of the vulcan izates as well as a modification of the interaction parameter.