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Specific Roles of Al‐Alkyl Cocatalyst in the Origin of Isospecificity of Active Sites on Donor‐Free TiCl~4~/MgCl~2~ Ziegler‐Natta Catalyst by Boping Liu; Takashi Nitta; Hisayuki Nakatani; Minoru Terano is a Materials Science article available to read on EtoBox.

What is Specific Roles of Al‐Alkyl Cocatalyst in the Origin of Isospecificity of Active Sites on Donor‐Free TiCl~4~/MgCl~2~ Ziegler‐Natta Catalyst about?

## Abstract The formation, deactivation and transformation of stereospecific active sites on the donor‐free TiCl~4~/MgCl~2~ catalyst induced by short time reaction with triethylaluminium (TEA) cocatalyst (pretreatment time: 0 ∼ 60 s) were investigated by stopped‐flow propylene polymerization combined with temperature rising elution fractionation (TREF) and gel permeation chromatography (GPC) methods. We got the first report that the origin of isospecificity of active sites derived from the catalyst substrate and cocatalyst were individually observed without and with TEA pretreatment, respectively. Based on the three‐sites model of Corradini and Busico et al., a plausible mechanism of the formation and transformation of stereospecific active sites was proposed using active sites models in terms of specified roles of Al‐alkyl cocatalyst. It was demonstrated that the introduction of bulky alkyl groups instead of chlorine atoms into the neighborhood of active sites seems to be crucial for the generation of active sites with the highest isospecificity. magnified image

Who reads Specific Roles of Al‐Alkyl Cocatalyst in the Origin of Isospecificity of Active Sites on Donor‐Free TiCl~4~/MgCl~2~ Ziegler‐Natta Catalyst?

Author

Boping Liu; Takashi Nitta; Hisayuki Nakatani; Minoru Terano

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1022-1352)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)