Styrene butadiene rubber categories in terms of production and polymerization methods
Emulsion method In this method, polymerization is done through free radicals, which is done in both hot and cold states. The product obtained by cold method in the presence of oil or in the presence of oil-soot has high linearity, narrow molecular distribution, high molecular mass and difficult processing. The product obtained by hot method is also highly branched and has a wide molecular mass distribution, good process ability and higher percentages of 1 and 2-vinyl. Solution method In this method is ion polymerization, the product of this method has high linearity, high flexibility and high abrasion and tear resistance against dynamic stresses. Gel method The product of this method has a weak percentage of chemical bonds during the polymerization reaction between the chains, which reduces the mobility of the chains and improves processability. cooking methods It is mainly done by sulfur vulcanization method. The cooking speed in the SBR…