Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

Participants

Reaction Steps

A 2 gallon reactor was initially flushed with nitrogen before being charged with a solution prepared from 540 g (5.19 moles) of styrene, 81.0 g (˜0.27 moles) of N,N-dimethyloctadecylamine and 4.77 g (˜0.0123 moles) of BHDTTC and stirred at 200 rpm. To this mixture was then added an aqueous solution prepared from 3510 g of RO water, 12.6 g (0.0466 moles) of potassium persulfate and 33.66 g of conc. Hydrochloric acid (˜0.34 moles). The reactor was again flushed with nitrogen before adding 1260 g (˜23.33 moles) of distilled butadiene. The stirred reactor was then heated to 65° C. with “solids” being taken every 2 hours to follow the progress of the polymerization. The reaction was shortstopped at ˜23 percent solids (˜65 percent conversion) with 45 g of a 2 percent aq. solution of 4-hydroxy TEMPO after 10.5 hours. The latex was then cooled and vacuumed stripped of residual monomers to yield a final latex with 24.1 percent solids, pH 1.53, viscosity of 352 cps, mechanical stability of 221 mg and an alcohol Mooney (ML4) of 37. NMR analysis indicates 23.3 percent styrene, 62.3 percent 1,4-BD and 14.4 percent 1,2-BD.

Provenance & Evidence