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Development of Bimodality Criterion for the Sequence Length Distribution of Ethylene/1‐Olefin Copolymers
Author(s) -
Anantawaraskul Siripon
Publication year - 2015
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.201500050
Subject(s) - bimodality , copolymer , metallocene , materials science , ethylene , olefin fiber , polymer , sequence (biology) , post metallocene catalyst , polymer chemistry , polymer science , thermodynamics , catalysis , composite material , organic chemistry , polymerization , chemistry , physics , biochemistry , quantum mechanics , galaxy
Summary Combination of two single‐site‐type metallocene catalysts can be used to produce polymers with well‐defined, broad microstructural distributions. Copolymers with unimodal and bimodal microstructural distributions were known to have distinct properties; therefore, it would be useful for the product development to have bimodality criterion for these microstructural distributions. In this work, a bimodality criterion for ethylene sequence length distribution (SLD) of ethylene/1‐olefin copolymers produced with two metallocene catalysts was theoretically developed to predict if a given combination of two metallocene catalysts would produce copolymers with bimodal or unimodal SLD. The proposed criterion was validated using simulation data of four hypothetical ethylene/1‐olefin copolymer blends, each with various compositional ratios. The characteristics of simulated SLD results were in a good agreement with the predictions from the proposed criterion.