Homonuclear Separated Local-Field Spectroscopy by Magnetization-Exchange NMR

• Authors: D.E. Demco , X. Filip , C. Filip , D. Chira , O. Cozar
• Languages of publication: EN

Abstracts

EN

The possibility to perform homonuclear separated-local field NMR spectroscopy by magnetization-exchange is presented. Solid-state one-dimensional proton magnetization-exchange NMR is used to investigate intergroup residual dipolar couplings in cis-1,4-polybutadiene elastomer. A three-spin model is employed, in which the CH- and CH_{2}-protons are considered to be coupled by residual dipolar interactions. The magnetization-exchange process between the CH- and the CH_{2}-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 average polymer-chain direction for different temperatures. The dynamic order parameter along the chains is also evaluated.

Keywords

EN

33.25.+k; 61.41.+e

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 92
• Issue: 6
• Pages: 1135-1149

Dates

published

1997-12

received

1997-07-07

Contributors

author

D.E. Demco

• Department of Physics, Technical University, 3400 Cluj-Napoca, Romania

author

X. Filip

• Institute for Isotopic and Molecular Technology, 3400 Cluj-Napoca, Romania

author

C. Filip

• Institute for Isotopic and Molecular Technology, 3400 Cluj-Napoca, Romania

author

D. Chira

• Faculty of Physics, University Babes-Bolyai, 3400 Cluj-Napoca, Romania

author

O. Cozar

• Faculty of Physics, University Babes-Bolyai, 3400 Cluj-Napoca, Romania