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Ethene/propene copolymerisation by [Me 2 C(3‐RCp)(Flu)]ZrCl 2 /MAO (R = H, Me, iso Pr, tert Bu)
Author(s) -
Arndt Michael,
Kaminsky Walter,
Schauwienold AnneMeike,
Weingarten Ulrich
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980601)199:6<1135::aid-macp1135>3.0.co;2-j
Subject(s) - triad (sociology) , propene , substituent , polymer chemistry , chemistry , polymer , migratory insertion , catalysis , medicinal chemistry , organic chemistry , psychology , psychoanalysis
Ethene/propene copolymerisations were carried out at 30°C and 60°C using four different metallocenes [Me 2 C(3‐RCp)(Flu)]ZrCl 2 (R = H, Me, iso Pr, tert Bu). With increasing size of the substituent distinct changes in the copolymerisation behaviour and polymer microstructure were observed. A copolymerisation model taking into account the heterotopic nature of the metallocenes has been developed which fits the experimental triad distributions obtained. It is concluded that copolymerisation proceeds via chain migratory insertion for R = H and Me whereas a retention mechanism is found for R = tert Bu. For R = iso Pr especially at 60°C a defective alternating mechanism seems to be operative.