Scanning electron microscopy observation of nascent polypropylene particles

✍ Scribed by L.C. Santa Maria; F.M.B. Coutinho; J.C. Bruno

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 590 KB
• Volume: 29
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(93)90187-k

✦ Synopsis

Abstraet--A study to achieve the control of polymer particles obtained by propylene polymerization with Ziegler-Natta catalyst based on TiCI3 was carried out. Two different catalysts were employed: Cat.A was made through TiCI4 reduction with diethylaluminium chloride (DEAC) in the presence of di-n-butyl ether (DBE) as first internal base and Cat.B was prepared through TiCI4 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.