STUDIES ON STYRENE SYNDIOSPECIFIC POLYMERIZATION AND PROPENE ATACTIC POLYMERIZATION WITH TITANOCENE/MAO/ AlR3 HOMOGENEOUS CATALYTIC SYSTEMS

ZHU Fangming; FANG Yutang; WANG Qunfang; LIN Shangan

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STUDIES ON STYRENE SYNDIOSPECIFIC POLYMERIZATION AND PROPENE ATACTIC POLYMERIZATION WITH TITANOCENE/MAO/ AlR3 HOMOGENEOUS CATALYTIC SYSTEMS

Research Article | 更新时间：2021-03-19

- STUDIES ON STYRENE SYNDIOSPECIFIC POLYMERIZATION AND PROPENE ATACTIC POLYMERIZATION WITH TITANOCENE/MAO/ AlR3 HOMOGENEOUS CATALYTIC SYSTEMS
- Acta Polymerica Sinica Issue 4, Pages: 424-430(1998)
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- Published：20 August 1998，
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ZHU Fangming, FANG Yutang, WANG Qunfang, LIN Shangan. STUDIES ON STYRENE SYNDIOSPECIFIC POLYMERIZATION AND PROPENE ATACTIC POLYMERIZATION WITH TITANOCENE/MAO/ AlR3 HOMOGENEOUS CATALYTIC SYSTEMS. [J]. Acta Polymerica Sinica (4):424-430(1998)
DOI：

ZHU Fangming, FANG Yutang, WANG Qunfang, LIN Shangan. STUDIES ON STYRENE SYNDIOSPECIFIC POLYMERIZATION AND PROPENE ATACTIC POLYMERIZATION WITH TITANOCENE/MAO/ AlR3 HOMOGENEOUS CATALYTIC SYSTEMS. [J]. Acta Polymerica Sinica (4):424-430(1998) DOI：

摘要

先考察部分水解三甲基铝（ＴＭＡ）制备固体改性甲基铝氧烷（ｍ-ＭＡＯ）时

反应物Ｈ２Ｏ和ＴＭＡ的摩尔比对固体产物ｍ-ＭＡＯ中ＴＭＡ含量的影响；然后考察不同的钛化合物特别是茂钛化合物（ＬｎＴｉＸｎ′

ｎ＝１

２

ｎ′＝２

３）和ｍ-ＭＡＯ组成的均相催化体系分别进行苯乙烯间规聚合和丙烯无规聚合的效果作比较．在此基础上分析以茂基三正丙氧基钛［ＣｐＴｉ（ＯＰｒｎ）３］为主催化剂

不同ＴＭＡ含量的ｍ-ＭＡＯ为助催化剂

及外加各种烷基铝（ＡｌＲ３）所组成的催化体系中钛的氧化数

同时对苯乙烯间规聚合和丙烯无规聚合进行比较研究

从中发现活性中心钛的氧化数以Ｔｉ（Ⅲ）为主时有利于苯乙烯间规聚合

不利于丙烯无规聚合；而氧化数以Ｔｉ（Ⅳ）为主时则对丙烯无规聚合有利．苯乙烯间规聚合时

外加烷基铝可节省ＭＡＯ用量．

Abstract

Syndiotactic polystyrene and atactic polypropene were synthesized with different titanium compounds

in particular of η5 cyclopentadienyltri n propoxy titanium [CpTi(OPrn)3] and modified methylaluminoxane (m-MAO) homogeneous catalytic system.The titanium ligands affect catalytic activity of styrene syndiospecific polymerization and propene polymerization.The effects of the percentage contents of the trimethylaluminum (TMA) coexisted inm-MAO

which can be controlled by changing H2O and TMA molar ratio during the preparation of MAO by partial hydrolysis of TMA with Al2(SO4)3·18H2O

on polymerization of styrene and propene have been studied in detail.The external addition of alkylaluminium(AIR3

trimethylaluminum

triethylaluminum

tri-isobutylalumimum) to CpTi(OPrn)3/m-MAO catalytic systems may also influence both catalytic activity and molecular weights of syndiotactic polystyrene produced.The oxidation states of titanium in different CpTi(OPrn)3/m-MAO catalytic systems were determined by redox titration method.It results that Ti(Ⅲ) is good for styrene syndiospecific polymerization in higher catalytic activity

while Ti(Ⅳ) is good for propene's polymerization.Oxidation state of tinanium in catalyst system does not clearly affect the tacticity of these two kind of polymers obtained.

关键词

茂金属催化剂甲基铝氧烷苯乙烯间规聚合间规聚苯乙烯无规聚丙烯

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