Isoprene → Isoprene butadiene

反応式

[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[CH2:6]=[CH:7][CH:8]=[CH2:9].C=CC1C=CC=CC=1>CO>[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:5].[CH2:6]=[CH:7][CH:8]=[CH2:9]

参加物

反応条件

温度: 50 °C

実験手順

Into a dried pressure vessel purged with nitrogen, 80 L of cyclohexane solvent and 0.34 L of sec-butyllithium initiator (10% by mass solution in cyclohexane) were charged. After raising the temperature to 50° C., 4.0 L of styrene was added to allow the polymerization to proceed for 3 h. Then, the polymerization was allowed to proceed for 4 h after adding a mixed liquid of 14.2 L of isoprene and 11.6 L of butadiene and further for 3 h after adding 4.0 L of styrene. The resultant reaction liquid was poured into 80 L of methanol, and the precipitated solid matter was separated by filtration and dried at 50° C. for 20 h, to obtain a polystyrene block-poly(isoprene/butadiene) block-polystyrene block, triblock copolymer.