The effect of BzOEt [93-89-0] as a component of the solid catalyst (internal base) and/or of the cocatalyst (external base) on polymn. of propene in the presence of MgCl2-supported Ziegler-Natta catalysts is discussed. Internal BzOEt mainly prevents TiCl4 from coordination on MgCl2 crystal faces where mostly non-stereospecific active sites would be formed, whereas external BzOEt inhibits non-stereospecific centers selectively and decreases the reaction of the Al alkyl with the internal base. A model of active sites for isotactic 1-alkenes in the presence of MgCl2-supported catalysts is presented, which agrees well with exptl. data.
POLYMERIZATION OF PROPENE IN THE PRESENCE OF MGCL2-SUPPORTED ZIEGLER-NATTA CATALYSTS .1. THE ROLE OF ETHYL BENZOATE AS INTERNAL AND EXTERNAL BASE / Busico, Vincenzo; Corradini, P; Demartino, L; Proto, A.; Savino, V.; Albizzati, E.. - In: DIE MAKROMOLEKULARE CHEMIE. - ISSN 0025-116X. - STAMPA. - (1985), pp. 1279-1288.
POLYMERIZATION OF PROPENE IN THE PRESENCE OF MGCL2-SUPPORTED ZIEGLER-NATTA CATALYSTS .1. THE ROLE OF ETHYL BENZOATE AS INTERNAL AND EXTERNAL BASE
BUSICO, VINCENZO;
1985
Abstract
The effect of BzOEt [93-89-0] as a component of the solid catalyst (internal base) and/or of the cocatalyst (external base) on polymn. of propene in the presence of MgCl2-supported Ziegler-Natta catalysts is discussed. Internal BzOEt mainly prevents TiCl4 from coordination on MgCl2 crystal faces where mostly non-stereospecific active sites would be formed, whereas external BzOEt inhibits non-stereospecific centers selectively and decreases the reaction of the Al alkyl with the internal base. A model of active sites for isotactic 1-alkenes in the presence of MgCl2-supported catalysts is presented, which agrees well with exptl. data.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
