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Polymerization of ethylene using high-activity Ziegler-type catalysts: Active center determination

✍ Scribed by Maria Mercês Marques; Peter J. T. Tait; Jirí Mejzlík; Alberto Romão Dias

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
230 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

The concentration of active centers of a high-activity magnesium chloridesupported Ziegler-Natta catalyst has been determined using three different methods. The initial active center concentration has been determined by quenching the reaction slurry with MeOT. To determine the concentration of the propagation species along the course of the polymerization the radio-tagging agent, 14 CO, and the tagging agent, CS 2 , were used. CS 2 , was also investigated as a tagging agent of the growing chains, in a metallocene catalyst system. The results obtained were compared to obtain some insight about the reliability of each method and the kind of information each method can provide.

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Copolymerization of ethylene/propylene elastomer using high-activity Ziegler–Natta catalyst system of MgCl2 (ethoxide type)/EB/PDMS/TiCl4/PMT
✍ G. H. Zohuri; F. Sadegvandi; R. JamJah; S. Ahmadjo; M. Nekoomanesh; E. Bigdelli 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 80 KB 👁 1 views

## Abstract A high‐activity Ziegler–Natta catalyst of TiCl~4~‐supported MgCl~2~ (ethoxide type) was prepared. Ethyl benzoate (EB) and polydimethylsiloxane (PDMS) were used as internal donors, while __p__‐methyl toluate (MPT) and triethylaluminum (TEA) were used as the external donor and cocatalyst,