STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅰ.SYNTHESIS OF PE-b-sPS BLOCK COPOLYMER

FANG Yutang; ZHU Fangming; LIN Shang'an

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STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅰ.SYNTHESIS OF PE-b-sPS BLOCK COPOLYMER

Research Article | 更新时间：2021-03-19

- STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅰ.SYNTHESIS OF PE-b-sPS BLOCK COPOLYMER
- Acta Polymerica Sinica Issue 4, Pages: 499-503(2001)
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- Published：20 August 2001，
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FANG Yutang, ZHU Fangming, LIN Shang'an. STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅰ.SYNTHESIS OF PE-b-sPS BLOCK COPOLYMER. [J]. Acta Polymerica Sinica (4):499-503(2001)
DOI：

FANG Yutang, ZHU Fangming, LIN Shang'an. STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅰ.SYNTHESIS OF PE-b-sPS BLOCK COPOLYMER. [J]. Acta Polymerica Sinica (4):499-503(2001) DOI：

摘要

以五甲基茂基三苄氧基钛 [Cp*Ti(OBz)3]为主催化剂、改性甲基铝氧烷 (mMAO)为助催化剂

进行乙烯与苯乙烯的嵌段共聚合反应.讨论了乙烯预聚温度、预聚时间、主催化剂的浓度、Al(mMAO)/Ti摩尔比、苯乙烯的浓度以及外加三异丁基铝 (TIBA)等条件对共聚反应的影响 .发现适宜的共聚反应条件为

预聚温度为40℃ ;主催化剂的浓度为 6.67×10-4 mol L ;铝钛摩尔比为200.共聚反应的催化效率随预聚时间的延长而降低;嵌段共聚物中苯乙烯链节含量随苯乙烯的浓度的增加而增加;外加TIBA对嵌段共聚物的形成及催化效率的提高起关键性作用.

Abstract

The block copolymerization of styrene and ethylene was carried out using a novel catalytic system of η5-pentamethylcyclopentadienyltribenzyloxy titanuim [Cp* Ti(OBz)3] and modified methylaluminoxane (mMAO)．The influence of prepolymerization temperature

time

Ti concentration

Al(mMAO)／Ti molar ratio

styrene concentration and the amount of external addition of triisobutylaluminum (TIBA) on copolymerization were investigated in detail． It seems that the conditions of prepolymerization temperature at 40℃

Ti concentration 6.67×10-4 mol／L and Al-(mMAO)／Ti molar ratio 200 are favorable for block copolymerization of styrene and ethylene．The content of sPS segment in copolymer increases with increasing styrene concentration

but the catalytic efficiency decreased with increasing prepolymerization time．External addition of TIBA has an important effect on the formation of block copolymer and enhancing of catalytic efficiency．

关键词

茂金属催化剂间规聚苯乙烯嵌段共聚合聚乙烯b间规聚苯乙烯嵌段共聚物

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