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Perturbed enantiomorphic‐site model
Author(s) -
Cheng H. N.
Publication year - 1993
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.1993.040020404
Subject(s) - tacticity , polymer , homogeneous , metallocene , polymer chemistry , catalysis , materials science , chemistry , polymer science , thermodynamics , organic chemistry , physics , polymerization
The perturbed enantiomorphic‐site (E) model was developed for the analysis of tacticity of Ziegler‐Natta polymers. Theoretical probability expressions for tacticity diads, triads, tetrads and pentads were derived, and a computer program incorporating perturbed enantiomorphic‐site and Bernoullian models was written to facilitate NMR analysis. Examples are shown of the use of the perturbed models to study the 13 C NMR tacticity of poly(propylene) made with homogeneous metallocene catalysts. The perturbed E model is shown to be a suitable theoretical framework for the analysis of many polymers made with these catalysts.