Resumo

CONTE, Anunciata  e  MARQUES, Maria de Fátima V.. Preparation conditions of Cp₂ZrCl₂ supported on silica using an experimental planning. Polímeros [online]. 2001, vol.11, n.1, pp.1-8. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282001000100005.

Ethylene was polymerized with the catalytic systems Cp₂ZrCl₂/SiO₂ and Cp₂ZrCl₂/MAO/SiO₂. A experimental planning model was developed in order to identify the best conditions for the preparation of metallocene heterogeneous catalysts. The variables used were methylaluminoxane (MAO) concentration of the support treatment, concentration and temperature of metallocene immobilization. The supported catalysts were analyzed by inductively coupled plasma emission spectometry and the polyethylene (PE) produced was characterized by gel permeation calorimetry (GPC) and differential scanning calorimetry (DSC). It was observed that the higher the zirconium concentration fixed on the support surface, the lower the catalyst activity, in the studied variables range.

Palavras-chave : Silica; heterogeneous catalyst; metallocene; polyethylene.

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