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Determination of monomer sequence distribution in EPDM by 13 C‐NMR: Third monomer effects
Author(s) -
Kolbert Andrew C.,
Didier Joseph G.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990124)71:4<523::aid-app1>3.0.co;2-g
Subject(s) - monomer , polymer chemistry , dicyclopentadiene , copolymer , materials science , sequence (biology) , carbon 13 nmr , tacticity , ethylene , norbornene , chemistry , polymer , polymerization , organic chemistry , catalysis , composite material , biochemistry
The methods for sequencing ethylene–propylene copolymers (EPMs) by 13 C‐NMR were extended to account for third monomer effects. The equations for calculating the ethylene content and monomer sequence distribution in EPMs were corrected for the presence of the third monomers 1,4 hexadiene, 2‐ethylidene‐5‐norbornene, and 5,8‐dicyclopentadiene that display resonances that overlap with the main chain EPM carbons. These corrections dramatically reduce the standard deviation among equivalent calculation methods. We also examined the effects of experimental conditions on the sequencing data including the choice of solvent, Cr 3+ doping, and the presence of the nuclear Overhauser effect. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 523–530, 1999