Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 211, Issue 1, Pages 91-102Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200900311
Keywords
ethylene polymerization; metallocene; morphology; particle size; porosity
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The role of certain morphological properties of different silica used as supports for metallocene catalysts was investigated in order to quantify their eventual influence on the kinetics of ethylene polymerisation in heptane slurry, as well as on the polymer properties. It was shown that there is no clear link between porosity and observed activity with some highly porous silica producing relatively inactive supported catalysts. It was further shown that within a batch of silica, the particle size had a significant impact on observed kinetics. While it appears that there is possibly some diffusion resistance encountered in the larger particles, it was also shown that prolonged contact between the support and the alkylating agent could increase reaction rates in the larger particles.
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