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Simultaneous Deconvolution of Molecular Weight Distribution and Chemical Composition Distribution of Ethylene/1‐Olefin Copolymers Synthesized with Multiple‐Site‐Type Catalytic Systems
Author(s) -
Anantawaraskul Siripon,
Bongsontia Warawut,
Soares João B.P.
Publication year - 2009
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.200950817
Subject(s) - copolymer , ethylene , deconvolution , active site , molar mass distribution , olefin fiber , materials science , catalysis , microstructure , polymer chemistry , chemical engineering , chemistry , organic chemistry , polymer , algorithm , computer science , composite material , engineering
Summary: Ethylene/1‐olefin copolymers synthesized with multiple‐site‐type catalytic systems typically exhibit broad molecular weight distribution (MWD) and chemical composition distribution (CCD). These microstrucral characteristics can be described by the presence of several active site types, each of which produces chains with distinct chain microstructures. In this work, a new approach to identify the number of active site types and chain microstructures produced on each active site type was developed based on simultaneous deconvolution of the bivariate MWD/CCD information. Chain microstructures produced on each active site type are assumed to follow Stockmayer's bivariate distribution. The proposed approach was validated with simulated data of model ethylene/1‐butene and ethylene/1‐octene copolymers.