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用 η5 五甲基环戊二烯基三苄氧基钛 /改性甲基铝氧烷 (Cp Ti(OBz) 3/mMAO)催化剂对苯乙烯 / 1 丁烯嵌段共聚合进行了研究 .考察了外加三异丁基铝 (TIBA) ,1 丁烯预聚合时间及苯乙烯浓度对聚合结果的影响 .发现外加TIBA的量对催化活性的影响存在峰值 ,[TIBA]=2 6mmol/L时催化活性最大 ,达到 12 2kgP/gTih ;催化活性随 1 丁烯预聚时间延长而降低 ;苯乙烯的浓度较低时 ,催化活性随其浓度增大而增大 ,但当苯乙烯的浓度大于 4 18mol/L时 ,催化活性变化不明显 .对嵌段共聚物用丁酮 ,四氢呋喃和氯仿连续萃取分离 ,四氢呋喃和氯仿中的可溶级份是嵌段共聚物sPS b PB ,占共聚合产物的 2 1 0～ 41 3wt % .对嵌段共聚物用13C NMR ,DSC ,WAXD和FTIR等手段进行了表征
The block copolymerization of styrene and 1-butene with η5 pentamethylcyclopentadienyltribenzyloxytitanium / modified methylaluminoxane (Cp Ti (OBz) 3 / mMAO) catalyst was investigated. The effects of addition of TIBA, 1-butene prepolymer and styrene concentration on the polymerization results showed that the amount of TIBA had a significant effect on the catalytic activity, and [TIBA] = 26 mmol / L The catalytic activity decreases with the pre-polymerization time of 1-butene. When the concentration of styrene is low, the catalytic activity increases with the concentration of styrene, but when the concentration of styrene is more than 4 18mol / L, the catalytic activity is not obvious.For the block copolymer with butanone, tetrahydrofuran and chloroform continuous extraction and separation, the soluble fraction in tetrahydrofuran and chloroform is block copolymer sPS b PB, accounting for 2 1 0 ~ 41 3wt%. The block copolymers were characterized by 13C NMR, DSC, WAXD and FTIR