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The effect of crosslinking in elastomers investigated by NMR analysis of 13 C edited transverse 1 H NMR relaxation
Author(s) -
Fülber Carsten,
Demco Dan E.,
Weintraub Ofer,
Blümich Bernhard
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970214
Subject(s) - homonuclear molecule , heteronuclear molecule , magnetization , relaxation (psychology) , nmr spectra database , chemistry , carbon 13 nmr , nuclear magnetic resonance , spectral line , chemical shift , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , physics , molecule , stereochemistry , organic chemistry , magnetic field , psychology , social psychology , quantum mechanics , astronomy
The transverse nuclear 1 H magnetization decay in poly(styrene‐ co ‐butadiene) (SBR) is investigated by editing 13 C NMR spectra. This technique allows for the assignment of localized 1 H dynamical information by discriminating the chemical sites based on their chemical shift in the 13 C dimension. Here, the homo‐ and heteronuclear dipolar couplings contribute to the 1 H NMR relaxation giving additional information to a homonuclear experiment. In this heteronuclear 2D experiment two prominent peaks are observed in the 13 C dimension, which correspond to CH and CH 2 groups, respectively. The decay rate in the 1 H dimension is found for both groups to scale with the crosslink density. An additional ultra‐fast magnetization decay is reported. The effect of the carbon black filler is investigated for this component. The analysis of the 13 C NMR edited transverse 1 H magnetization relaxation is a useful tool in combining high resolution NMR spectra with information on molecular dynamics, providing insight into crosslink density and filler effects.