Catalysts 2013, 3(1), 137-147; doi:10.3390/catal3010137
Article

Precise Active Site Analysis for TiCl3/MgCl2 Ziegler-Natta Model Catalyst Based on Fractionation and Statistical Methods

Shougo Takahashiemail, Toru Wadaemail, Toshiaki Taniikeemail and Minoru Terano* email
School of Materials Science, Japan Advance Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
* Author to whom correspondence should be addressed.
Received: 17 December 2012; in revised form: 30 January 2013 / Accepted: 1 February 2013 / Published: 7 February 2013
(This article belongs to the Special Issue Molecular Catalysis for Precise Olefin Polymerization)
PDF Full-text Download PDF Full-Text [573 KB, uploaded 7 February 2013 08:59 CET]
Abstract: In heterogeneous Ziegler-Natta catalysts for olefin polymerization, isolation of a single type of active sites is a kind of ambition, which would solve long-standing questions on the relationship between active site and polymer structures. In this paper, polypropylene produced by TiCl3/MgCl2 model catalysts with minimum Ti heterogeneity was analyzed by combined solvent fractionation and the two-site statistical model. We found that the active sites of the model catalysts were classified into only three types, whose proportions were dependent on the Ti dispersion state. The addition of external donors not only newly formed highly isospecific sites, but also altered the stereochemical nature of the other active sites.
Keywords: Ziegler-Natta catalysts; propylene polymerization; model catalyst; active site; two-site model analysis

Article Statistics

Click here to load and display the download statistics.

Cite This Article

MDPI and ACS Style

Takahashi, S.; Wada, T.; Taniike, T.; Terano, M. Precise Active Site Analysis for TiCl3/MgCl2 Ziegler-Natta Model Catalyst Based on Fractionation and Statistical Methods. Catalysts 2013, 3, 137-147.

AMA Style

Takahashi S, Wada T, Taniike T, Terano M. Precise Active Site Analysis for TiCl3/MgCl2 Ziegler-Natta Model Catalyst Based on Fractionation and Statistical Methods. Catalysts. 2013; 3(1):137-147.

Chicago/Turabian Style

Takahashi, Shougo; Wada, Toru; Taniike, Toshiaki; Terano, Minoru. 2013. "Precise Active Site Analysis for TiCl3/MgCl2 Ziegler-Natta Model Catalyst Based on Fractionation and Statistical Methods." Catalysts 3, no. 1: 137-147.

Catalysts EISSN 2073-4344 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert