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Ethylene Polymerization over Supported Titanium‐Magnesium Catalysts: Heterogeneity of Active Centers and Effect of Catalyst Composition on the Molecular Mass Distribution of Polymer
Author(s) -
Zakharov Vladimir,
Matsko Mikhail,
Echevskaya Ludmila,
Mikenas Tatiana
Publication year - 2008
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.200751427
Subject(s) - dispersity , molar mass distribution , polymer , titanium , magnesium , catalysis , polymerization , materials science , chemical engineering , mass fraction , ethylene , polymer chemistry , chemistry , organic chemistry , metallurgy , composite material , engineering
New experimental approach was used for analysis of molecular weight distribution (MWD) of polymers produced over titanium‐magnesium catalysts (TMC). Polymers were fractionated on to fractions with narrow MWD (polydispersity (PD) values Mw/Mn ≤ 2). Then some of these fractions were combined to get the minimal quantity of fractions with PD values close to 2 (Flory components). It was found that three fractions corresponding to three groups of active centers are sufficient for proper fitting experimental MWD curve for PE obtained over TMC with different Ti content and with different hydrogen concentration in polymerization.