Scanning electron microscopy observation of nascent polypropylene particles

A study to achieve the control of polymer particles obtained by propylene polymerization with Ziegler-Natta catalyst based on TiCl 3 was carried out. Two different catalysts were employed: Cat. A was made through TiCl 4 reduction with diethylaluminium chloride (DEAC) in the presence of di-n-butyl et...

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Bibliographic Details
Published in:European polymer journal 1993-10, Vol.29 (10), p.1319-1322
Main Authors: Santa Maria, L.C., Coutinho, F.M.B., Bruno, J.C.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:A study to achieve the control of polymer particles obtained by propylene polymerization with Ziegler-Natta catalyst based on TiCl 3 was carried out. Two different catalysts were employed: Cat. A was made through TiCl 4 reduction with diethylaluminium chloride (DEAC) in the presence of di-n-butyl ether (DBE) as first internal base and Cat.B was prepared through TiCl 4 reduction with DEAC in the presence of DBE as first internal base and ethyl benzoate (EB) as second internal base, added after the reduction and before the thermal treatment at 70°. The progress of propylene polymerization was evaluated. Fragmentation of catalyst particles and a “replica” phenomenon were observed during the polymerization. The rupture of polypropylene particles was attributed to their friability and to the uncontrolled kinetics of the polymerization.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(93)90187-K