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Recipes for synthesizing polyolefins with tailor‐made molecular weight, polydispersity index, long‐chain branching frequencies, and chemical composition using combined metallocene catalyst systems in a CSTR at steady state
Author(s) -
Beigzadeh D.,
Soares J. B. P.,
Hamielec Archie E.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990314)71:11<1753::aid-app5>3.0.co;2-5
Subject(s) - branching (polymer chemistry) , metallocene , dispersity , continuous stirred tank reactor , post metallocene catalyst , catalysis , polymer chemistry , copolymer , polyethylene , polymerization , materials science , molar mass distribution , chemical engineering , chemistry , polymer , organic chemistry , composite material , engineering
Polymerization of ethylene in a CSTR using a combined metallocene catalyst system (combination of an open‐face catalyst, such as Constrained Geometry Catalyst, and a conventional metallocene catalyst) was studied. Using the model developed by Soares and Hamielec, and expanded by Beigzadeh et al., a steady‐state simulator was prepared. The effects of different process parameters (such as reactor residence time) and kinetic parameters of the combined catalyst system on steady‐state values of molecular weight, polydispersity index, long‐chain branching frequency, and copolymer composition (in the case of copolymerization with α‐olefins) were investigated. It was shown how recipes for synthesizing polyolefins with tailor‐made MWD, CCD, and LCB frequencies can be designed. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1753–1770, 1999