HOMONUCLEAR SEPARATED LOCAL-FIELD SPECTROSCOPY BY MAGNETIZATION-EXCHANGE NMR

Citation
De. Demco et al., HOMONUCLEAR SEPARATED LOCAL-FIELD SPECTROSCOPY BY MAGNETIZATION-EXCHANGE NMR, Acta Physica Polonica. A, 92(6), 1997, pp. 1135-1149
Citations number
44
Journal title
ISSN journal
05874246
Volume
92
Issue
6
Year of publication
1997
Pages
1135 - 1149
Database
ISI
SICI code
0587-4246(1997)92:6<1135:HSLSBM>2.0.ZU;2-M
Abstract
The possibility to perform homonuclear separated-local field NMR spect roscopy by magnetization-exchange is presented. Solid-state one-dimens ional proton magnetization-exchange NMR is used to investigate intergr oup residual dipolar couplings in cis-1,4-polybutadiene elastomer. A t hree-spin model is employed, in which the CR-and CH2-protons are consi dered to be coupled by residual dipolar interactions. The magnetizatio n-exchange process between the CH- and the CH2-group in the regime of short mixing time provides valuable insight regarding molecular order. The spin-system response reflects well-localized dipolar interactions . The residual intergroup dipolar couplings are measured along the ave rage polymer-chain direction for different temperatures. The dynamic o rder parameter along the chains is also evaluated.