Influence of the particle size of the MgCl 2 support on the performance of Ziegler catalysts in the polymerization of ethylene to ultra‐high molecular weight polyethylene and the resulting polymer properties

A highly systematic size series of Ziegler catalysts with similar porosities and surface textures are synthesized by varying the stirring speed during the MgCl 2 support synthesis. Besides the mean particle size, the only substantial difference observed between the various catalysts is the size and...

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Veröffentlicht in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2017-08, Vol.55 (16), p.2679-2690
Hauptverfasser: Philippaerts, An, Ensinck, Richard, Baulu, Nicolas, Cordier, Astrid, Woike, Kersten, Berthoud, Romain, De Cremer, Gert, Severn, John R.
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container_end_page 2690
container_issue 16
container_start_page 2679
container_title Journal of polymer science. Part A, Polymer chemistry
container_volume 55
creator Philippaerts, An
Ensinck, Richard
Baulu, Nicolas
Cordier, Astrid
Woike, Kersten
Berthoud, Romain
De Cremer, Gert
Severn, John R.
description A highly systematic size series of Ziegler catalysts with similar porosities and surface textures are synthesized by varying the stirring speed during the MgCl 2 support synthesis. Besides the mean particle size, the only substantial difference observed between the various catalysts is the size and number of nodules per particle. Varying the mean diameter of the catalyst particles between 1.5 and 11.9 µm, leads to a pronounced impact on the activity in ultra‐high molecular weight polyethylene (UHMWPE) polymerization, while the M w capabilities are only affected to a limited extend. In addition, it is observed that both the M w s as the polymer bulk density (BD) increases during the course of the polymerization. This particularity allows to optimize the M w and/or BD at a set polymer size, by tuning the catalyst particle size. This is particularly interesting in UHMWPE production, as control of the morphological and structural properties of the UHMWPE reactor powders are critical for efficient processing as well as the performance of the final product. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 2679–2690
doi_str_mv 10.1002/pola.28674
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title Influence of the particle size of the MgCl 2 support on the performance of Ziegler catalysts in the polymerization of ethylene to ultra‐high molecular weight polyethylene and the resulting polymer properties
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