SYNTHESIS OF POLYBUTADIENE WITH TITANOCENE CATALYST

HUANG Dongdong; ZHU Fangming; LIN Shang'an

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SYNTHESIS OF POLYBUTADIENE WITH TITANOCENE CATALYST

Research Article | 更新时间：2021-03-19

- SYNTHESIS OF POLYBUTADIENE WITH TITANOCENE CATALYST
- Acta Polymerica Sinica Issue 5, Pages: 580-583(2001)
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- Published：20 October 2001，
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HUANG Dongdong, ZHU Fangming, LIN Shang'an. SYNTHESIS OF POLYBUTADIENE WITH TITANOCENE CATALYST. [J]. Acta Polymerica Sinica (5):580-583(2001)
DOI：

HUANG Dongdong, ZHU Fangming, LIN Shang'an. SYNTHESIS OF POLYBUTADIENE WITH TITANOCENE CATALYST. [J]. Acta Polymerica Sinica (5):580-583(2001) DOI：

摘要

由五甲基单茂钛化合物Cp*TiL3 和甲基铝氧烷 (MAO)组成的催化体系进行丁二烯聚合 .考察具有不同辅助配体L的主催化剂Cp*TiL3 及外加三异丁基铝 (TIBA)对聚合的选择性 ;讨论了聚合温度、AlMAO/Ti摩尔比和催化剂浓度对聚合反应的影响 .发现外加适量TIBA有助于提高催化活性

而且随着TIBA用量的增加聚丁二烯分子量增加 .结合钛氧化态分析

说明催化体系中Ti(Ⅲ )活性中心更有利于丁二烯聚合.

Abstract

Polybutadienes were synthesized with η5-pentamethycyclopentadienyltri group titanium[Cp* TiL3

L=chloride

benzyloxy

p-methoxyphenoxy] in the presence of methylaluminoxane (MAO)．The influences of polymerization temperature [Tp]

catalyst concentration [Ti] and AlMAO／Ti molar ratio on butadiene polymerization have been studied．The external addition of triisobutylaluminum (TIBA) into the catalyst system gave a great promotion on the catalytic activity and the molecular weight of polybutadienes．The results showed that the best polymerization conditions with Cp* Ti(OBz)3／MAO as the catalytical system were [Ti] =1×10-3 mol／L

Tp=60℃

AlMAO/Ti=400(mol／mol) and AlTIBA/Ti=100．The oxidation states of active titanium centers ln Cp* Ti(OBz)3／MAO catalytic system have been determined by the redox titration method．It seems that the active center of Ti(Ⅲ) is favourable for butadiene polymerization with higher catalytic activity．

关键词

茂钛催化剂甲基铝氧烷(MAO)聚丁二烯(PBd)

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