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2D NMR characterization of poly(ethylene‐ co ‐5‐vinyl‐2‐norbornene)
Author(s) -
Lasarov Harri,
Pakkanen Tuula T.
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990601)20:6<356::aid-marc356>3.0.co;2-b
Subject(s) - methylaluminoxane , heteronuclear molecule , norbornene , homonuclear molecule , ethylene , dept , carbon 13 nmr , polymer chemistry , metallocene , double bond , copolymer , materials science , proton nmr , catalysis , polymerization , chemistry , nuclear magnetic resonance spectroscopy , organic chemistry , stereochemistry , molecule , polymer
Unsaturated poly(ethylene‐ co ‐5‐vinyl‐2‐norbornene) was synthetized using the [Ph 2 C(Flu)(Cp)]ZrCl 2 metallocene/methylaluminoxane (MAO) catalyst system. 1 H and 13 C NMR spectra of the copolymer were assigned by means of DEPT, homonuclear 2D 1 H‐ 1 H COSY, and heteronuclear 2D 1 H‐ 13 C correlation NMR experiments. The used catalyst system produces mainly isolated 5‐vinyl‐2‐norbornene (VNB) sequences. VNB is incorporated selectively via the cyclic double bond. The unreacted double bond of the copolymer exists in the 5‐ endo : 5 ‐exo positions (3 : 1). Both isomers of VNB are polymerized with the same propability.