Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/80317
Type: Artigo de periódico
Title: REDUCED TITANIUM-DIOXIDE AS SUPPORT FOR ZIEGLER-NATTA CATALYSTS
Author: JERICO, S
SCHUCHARDT, U
KAMINSKY, W
JOEKES, I
Abstract: Titanium tetrachloride heterogenized on reduced TiO2 has been studied as a catalyst for ethylene polymerization. The catalyst has good storage stability and exhibits good activity for ethylene polymerization. The polymer chains grow linearly during ca. 1 h, giving an average molecular weight of up to 2.5 X 10(6) which indicates that practically no beta-elimination occurs. The activity of the catalyst at 50-degrees-C, based on Ti(III), is 7.6 X 10(6) PE/mol Ti h bar and based on the quantity of polyethylene formed it is 1.25 X 10(6) g PE/mol Ti h bar. The molecular weight of the polymer can be controlled with the addition of hydrogen; under 0.5 bar hydrogen, polyethylene with a molecular weight of 411,000 and a relatively low polydispersity index of 2.2 is obtained. The catalyst shows good thermal stability; the Arrhenius activation energy is 31.8 kJ/mol for the polymerization. The catalyst is also active for propylene polymerization, giving 3 X 10(6) g PP/mol Ti h bar with the high isotacticity of 93%. (C) 1994 John Wiley & Sons, Inc.
Subject: REDUCED TITANIUM DIOXIDE
SUPPORTED TITANIUM TETRACHLORIDE
ETHYLENE POLYMERIZATION
Editor: John Wiley & Sons Inc
Rights: fechado
Identifier DOI: 10.1002/pola.1994.080320514
Date Issue: 1994
Appears in Collections:Unicamp - Artigos e Outros Documentos

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