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

Participants

Reaction Steps

5,000 g of cyclohexane, 950 g of 1,3-butadiene, 200 g of tetrahydrofuran and 1 g of n-BuLi were added to a reactor having an inner volume of 10 L replaced with nitrogen, which was adiabatically polymerized at initiation temperature of 10° C. Then 30 minutes later, 50 g of styrene was added, which was further polymerized to obtain a butadiene/styrene block copolymer. An aliquot of the butadiene/styrene block copolymer sampling had a 1,2-bond of 81%, the styrene bound content of 4.8%, and a weight-average molecular weight measured with GPC of about 120 thousands. Then, 3.6 g of dimethyldiphenoxysilane was added to the system containing the butadiene/styrene block copolymer, which was reacted for 30 minutes. Then, using a catalyst B in place of a catalyst A prepared in Experimental Example 1, a hydrogenating reaction was carried out according to the same manner as that of Example 33 to obtain a hydrogenated modified block copolymer. The resulting hydrogenated modified block copolymer had a hydrogenation rate of 98%, a weight-average molecular weight of about 130 thousands, a coupling rate of 19.7%, and MFR measured at 230° C. and a load of 2.16 kg of 10.5 g/10 min. In addition, a modified rate obtained by the same manner of Example 33 was 0.83/polymer.

Provenance & Evidence