Polymerization of ethylene by chromium acetylacetonate/methylaluminoxane catalyst system |
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| Authors: | Fernanda M. B. Coutinho Renato K. Iwamoto Marcos A. S. Costa Luiz Claudio de Santa Maria |
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| Affiliation: | Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, P.O. Box 68525, CEP 21945-970 Rio de Janeiro, RJ, Brazil, BR
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| Abstract: | Summary The present paper deals with polymerization of ethylene by chromium acetylacetonate - Cr(acac)3 - activated by alkylaluminium, e.g. Al(C2H5)3 or Al(i-C5H9)3, or methylaluminoxane (MAO). The influence of polymerization parameters on catalyst performance, such as Al/Cr mole ratio, temperature, aging time, type of cocatalyst, was investigated. High activities were obtained only when MAO was the cocatalyst. The polymers were characterized by size exclusion chromatography (SEC) and differential scanning calorimetry (DSC) analyses. Received: 11 September 1997/Revised version: 5 January 1998/Accepted: 20 March 1998 |
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