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Results coming from homogeneous and supported metallocene catalysts in the homo‐ and copolymerization of olefins
Author(s) -
Quijada Raúl,
Retuert Jaime,
Guevara Juan L.,
Rojas René,
Valle Marcela,
Saavedra Pilar,
Palza Humberto,
Galland Griselda B.
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200290001
Subject(s) - comonomer , methylaluminoxane , metallocene , copolymer , catalysis , polymer chemistry , post metallocene catalyst , monomer , homogeneous catalysis , propylene oxide , materials science , homogeneous , ethylene , heterogeneous catalysis , polymer , polymerization , chemistry , ethylene oxide , organic chemistry , physics , thermodynamics
Ethylene, propylene and α‐olefins were homo‐ and copolymerized in the presence of a series of homogeneous catalytic systems consisting of methylaluminoxane (MAO) and group IV metallocenes such as Et(Ind) 2 ZrCl 2 (I), Me 2 Si(Ind) 2 ZrCl 2 (II), Et(2‐Me‐Ind) 2 ZrCl 2 (III), Ph 2 C(Flu)(Cp)ZrCl 2 (IV). It was found that the catalytic activity, the incorporation of comonomer in the case of copolymers, and the microstructure of the polymers depend on the catalyst's structure. For heterogeneous catalysts, several supports based on metal oxide compounds have been investigated, with special emphasis in those obtained by the sol‐gel preparation technique. The homo‐ and copolymerization of the monomers in the homogeneous systems studied where also investigated using the same catalyst system, but in a heterogeneous medium. Comparative results from the homogeneous and heterogeneous systems are presented and discussed.