反应详情

367 mL of toluene, TIBA (1.8 mmol) and 25 mL of styrene were placed in a 1 L autoclave, which had been dried by heating, at room temperature under a nitrogen atmosphere. After making the temperature thereof to 70° C. under stirring, 7.5 mL of a toluene solution of (9-ethyl-1,2,3,4-tetrahydro-1-fluorenyl)-bis(N,N-dimethylaminobenzyl)scandium obtained in the item (E) of Example 1 (0.027 mmol) and triphenylcarbenium tetrakispentafluorophenylborate (0.027 mmol), which had been mixed in advance, was added thereto. The mixture was polymerized for 10 minutes, and further polymerized for 5 minutes while maintaining the pressure to 0.2 MPa with ethylene. Thereafter, ethylene was depressurized, and 25 mL of styrene was newly added, followed by polymerizing for 10 minutes. As a result, 43.8 g of a styrene-ethylene triblock copolymer was obtained.

1. additionhad been mixed in advance
2. additionwas added
3. customThe mixture was polymerized for 10 minutes
4. customfurther polymerized for 5 minutes
5. customfollowed by polymerizing for 10 minutes