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A Simplified Comprehensive Kinetic Scheme for Modeling of Ethylene/1‐butene Copolymerization Using Ziegler‐Natta Catalysts
Author(s) -
Ahmadi Mostafa,
Nekoomanesh Mehdi,
Arabi Hassan
Publication year - 2010
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.200900039
Subject(s) - comonomer , natta , copolymer , polymerization , ethylene , reaction rate constant , polymer chemistry , olefin fiber , butene , thermodynamics , catalysis , kinetic energy , kinetic scheme , chemistry , materials science , kinetics , organic chemistry , physics , polymer , classical mechanics
Abstract A simplified kinetic scheme of eythylene/ α ‐olefin copolymerization has been developed by adding reactions responsible for the unusual kinetic behavior to a general mechanism. The estimation of rate constants has been simplified by making physically meaningful initial guesses. Rate constants affecting yield, MWD and comonomer content have been estimated separately. Experiments were designed to investigate the effects of each rate constant independently. The obtained rate constants show that the sites which are responsible for formation of short chains with higher 1‐butene content are more active at the beginning of polymerization, while the sites which are responsible for formation of longer chains with lower 1‐butene units are more active at the final stages of polymerization.