STUDIES ON SYNDIOSPECIFIC POLYMERIZATION OF STYRENE AND POLYMERIZATION OF ETHYLENE WITH NOVEL TITANOCENE CATALYST

FANG Yutang; ZHU Fangming; WANG Qunfang; LIN Shangan

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STUDIES ON SYNDIOSPECIFIC POLYMERIZATION OF STYRENE AND POLYMERIZATION OF ETHYLENE WITH NOVEL TITANOCENE CATALYST

Research Article | 更新时间：2021-03-19

- STUDIES ON SYNDIOSPECIFIC POLYMERIZATION OF STYRENE AND POLYMERIZATION OF ETHYLENE WITH NOVEL TITANOCENE CATALYST
- Acta Polymerica Sinica Issue 1, Pages: 41-45(2000)
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- Published：20 February 2000，
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FANG Yutang, ZHU Fangming, WANG Qunfang, LIN Shangan. STUDIES ON SYNDIOSPECIFIC POLYMERIZATION OF STYRENE AND POLYMERIZATION OF ETHYLENE WITH NOVEL TITANOCENE CATALYST. [J]. Acta Polymerica Sinica (1):41-45(2000)
DOI：

FANG Yutang, ZHU Fangming, WANG Qunfang, LIN Shangan. STUDIES ON SYNDIOSPECIFIC POLYMERIZATION OF STYRENE AND POLYMERIZATION OF ETHYLENE WITH NOVEL TITANOCENE CATALYST. [J]. Acta Polymerica Sinica (1):41-45(2000) DOI：

摘要

考察三甲基铝（ＴＭＡ）部分水解法制备固体改性甲基铝氧烷（ｍＭＡＯ）时

反应物Ｈ２Ｏ和ＴＭＡ的摩尔比对ｍＭＡＯ的产量及ｍＭＡＯ中ＴＭＡ含量的影响；以五甲基茂基三苄氧基钛［Ｃｐ*Ｔｉ（ＯＢｚ）3］／ｍＭＡＯ组成的均相催化体系

分别考察ｍＭＡＯ的用量［即Ａｌ／Ｔｉ摩尔比］及ｍＭＡＯ中ＴＭＡ含量对苯乙烯间规聚合和乙烯聚合的影响．通过分析Ｃｐ*Ｔｉ（ＯＢｚ）３／ｍＭＡＯ催化体系钛氧化态的分布

发现Ｔｉ（Ⅲ）活性中心有利于合成间规聚苯乙烯；而Ｔｉ（Ⅳ）活性中心有利于合成聚乙烯．苯乙烯间规聚合时

外加三异丁基铝（ＴＩＢＡ）

将提高催化活性

同时可节省ＭＡＯ用量．

Abstract

Syndiotactic polystyrene (sPS) and polyethylene were comparatively synthesized with homogeneous catalytic systems composing η5-pentamethycyclopentadienyltribenzyloxy titanium [Cp*Ti(OBz)3] and various modified methylaluminoxanes (mMAO).The content of TMA in mMAO can be controlled by regulating H2O/TMA molar ratio during the preparation of mMAO by partial hydrolysis of TMA with Al2(SO4)3·18H2O.The effect of Al/Ti molar ratio on polymerization of styrene as well as ethylene have been studied in detail. The oxidation states of titanium in Cp* Ti(OBz)3/MAO catalytic systems were determined by redox titration method. It seems that active centre of Ti(Ⅲ) is favorable for styrene syndiospecific polymerization with higher catalytic activity

while Ti(Ⅳ)center is favorable for ethylene polymerization.The styene syndiospecific polymerization may also be nifluenced by the external addition of tri-isobutyl-aluminum(TIBA) into the same catalytic sistem giving higer yiela but slightly lower molecuar weight of sPS.

关键词

茂金属催化剂甲基铝氧烷间规聚苯乙烯聚乙烯

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