✦ LIBER ✦

ESR study on SiO2-supported half-titanocene catalyst for syndiospecific polymerization of styrene

✍ Scribed by Junting Xu; Jian Zhao; Zhiqiang Fan; Linxian Feng

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 366 KB
Volume: 18
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1997.030180916

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Monocyclopentadienyltitanium trichloride (CpTiCl~3~) was directly immobilized on silica surface. The resulting CpTiCl~3~/SiO~2~‐MAO was investigated in view of its suitability for syndiospecific polymerization of styrene using ESR spectroscopy. Polymerization results show that both the syndiotacticity and the activity decrease upon immobilization. A possible explanation is that the active sites may become aspecific after immobilization and part of the immobilized active sites can be leached into the solution in the presence of MAO.

📜 SIMILAR VOLUMES

Polymer-supported half-titanocene cataly

Polymer-supported half-titanocene catalysts for the syndiospecific polymerization of styrene

✍ Junting Xu; Jianying Ouyang; Zhiqiang Fan; Dequan Chen; Linxian Feng 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 168 KB 👁 1 views

Monocyclopendienyltitanium trichloride (CpTiCl 3 ) was supported on polymer carriers with different hydroxyl contents, and the supported catalysts were used for styrene polymerization. The supported catalysts exhibited high activity even at low Al/Ti ratios and increased the molecular weight of the

Polymer-supported half-titanocene cataly

Polymer-supported half-titanocene catalysts for the syndiospecific polymerization of styrene

✍ Junting Xu; Jianying Ouyang; Zhiqiang Fan; Dequan Chen; Linxian Feng 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 90 KB 👁 1 views

A kinetic study of novel bimetallic tita

A kinetic study of novel bimetallic titanocene catalyst for syndiospecific styrene polymerization

✍ Jin-Heong Yim; Kuk Young Cho 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 96 KB 👁 1 views

Preparation of tethered half-titanocene

Preparation of tethered half-titanocene complex on cross-linked polystyrene beads for using in syndiospecific polymerization of styrene

✍ Sohrab Rahmani; A.A. Entezami 📂 Article 📅 2010 🏛 Elsevier Science 🌐 English ⚖ 820 KB

ESR study on styrene polymerization with

ESR study on styrene polymerization with CpTiCl3/MMAO: Effect of monomer addition on catalyst activity

✍ Y. H. Huang; W.-J. Wang; S. Zhu; G. L. Rempel 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 162 KB 👁 2 views

An on-line electron spin resonance (ESR) technique was applied to investigate the syndiospecific polymerization of styrene activated by the catalyst system CpTiCl 3 /MMAO. The measurements included trivalent titanocene concentration and monomer conversion. The activation procedure was found to have

Surface acidic sites on supported titani

Surface acidic sites on supported titanium-magnesium catalyst for propylene polymerization: ESR study via adsorption of stable nitroxyl radicals

✍ Alexandr G. Potapov; Vladimir A. Zakharov; Tatijana B. Mikenas; Sergeyi A. Serge 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 340 KB

## Abstract ESR was used for studying the interaction between the stable nitroxyl radical TEMPO (2,2,6,6‐tetramethylpyperidin‐1‐oxyl) and the titanium‐magnesium catalysts TiCl~4~/MgCl~2~ and TiCl~4~/MgCl~2~ · __n__D (D is either diisobutyl phthalate or 2,2‐diisobutyl‐1,3‐dimethoxypropane), as well