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Determination of the number of active centers in Ziegler‐Natta polymerizations of olefins
Author(s) -
Mejzlík Jiří
Publication year - 1986
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19860030127
Subject(s) - labelling , polymerization , natta , macromolecule , polymer , catalysis , chemistry , active center , polymer science , polymer chemistry , combinatorial chemistry , materials science , organic chemistry , biochemistry
The methods employed for determination of the number of active centers are classified according to their principles into the following categories: (i) labelling of an organometal component as an initiating species; (ii) labelling of growing chains based on the number of macromolecules, on the number of metal‐polymer bonds, and on selective tagging of the growing chain; (iii) inhibition (retardation) of polymerization by effective catalyst poisons and calculation of the number of active centers on the basis of the poison consumption data. Typical features of the above categories are presented and advantages, as well as shortcomings of the methods are discussed.