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5566961 
Journal Article 
EFFECTS OF EXTERNAL LEWIS BASE ON THE PERFORMANCE OF MGCL2 SUPPORTED CATALYSTS IN PROPYLENE POLYMERIZATION 
Yang, CB; Hsu, CC 
1993 
1 
Polymer Bulletin
ISSN: 0170-0839
EISSN: 1436-2449 
Springer-Verlag 
NEW YORK 
30 
5 
529-535 
English 
WOS:A1993LC89600008 
The effects of four different external Lewis bases on propylene polymerization using the MgCl2-supported TiCl4 catalyst were studied in the context of the variation of the chemical complexes formed between catalyst, catalyst support and internal Lewis base, and the interactions between complexes and external Lewis base, The internal Lewis base used in this study was dioctyl phthalate. With ethyl benzoate as the external donor no change in activity was observed, but the interaction between ethyl benzoate and MgCl2·phthaloyl chloride complex resulted in a decrease of isotacticity. Increasing the bulkiness of the external Lewis base hindered the monomer coordination. It was found that the relative amount of the phthaloyl chloride complex to other complexes played an important role in the formation of active sites. © 1993 Springer-Verlag.