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

Participants

Reaction Conditions

Reaction Steps

A polymer solution of polystyrene-polybutadiene di-block copolymer SB-1(H) was prepared as follows. 1885 grams of cyclohexane (with 120ppm THF) solvent was added into a 5-liter autoclave and heated to 55° C. 92.1 grams of styrene monomers and 7.2 grams of 15 wt.% n-butyl lithium were added sequentially to start polymerization. While the styrene monomers were almost completely reacted, 215 grams of butadiene monomers were added to continue polymerization until the butadiene monomers were almost completely reacted. The reaction was then terminated by adding 1.7 grams of water. After stirring for 20minutes, 0.7 phr of antioxidant (mixture of phosphite series Irgafos 126 and phenolic series Irganox 1076 antioxidants) was added following by well stirring, and thus the polymer solution of the polystyrene-polybutadiene di-block copolymer SB-1(H) was obtained. The polystyrene-polybutadiene di-block copolymer SB-1(H) had a weight-average molecular weight of about 30000 g/mol., and a polystyrene content of about 30 wt.%.

Provenance & Evidence