Solution polymerizations SSBR

Solution polymerization (SSBR)—via anionic polymerization. Produces a random copolymer. Its composition and monomer reactivity ratios (monomer seqnence distribntion along macromolecule chain) are different than in the case of the ESBR (Table 21.2). 

Solution polymerization can use various solvents, primarily aUphatic and aromatic hydrocarbons. The choice of solvent is usually dictated by cost, avaHabihty, solvency, toxicity, flammabiUty, and polymer stmcture. SSBR polymerization depends on recovery and reuse of the solvent for economical operation as well as operation under the air-quaUty perrnitting of the local, state, and federal mandates involved. 

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