The cross-polarization dynamics between H-1 and F-19 in a Viton-type fluoroelastomer were studied using F-19 magic angle spinning (MAS) and H-1 F-19 cross-polarization (CP)/MAS NMR at 188.29 MHz. The phenomenological theory of spin thermodynamics based on the spin temperature hypothesis was employed to describe the polarization transfer between the H-1 and F-19 spin baths. Simultaneous fitting of the evolution of magnetization in the standard CP and a modified CP(TORQUE) experiment, using the exact solutions of the equations for the spin thermodynamics, gave unique sets of the parameters T-HF, T-1 rho(H) and T-1 rho(F) for five separate peaks in the F-19 spectra. The values of T-1 rho(H) and T-1 rho(F) obtained are consistent with those independently measured by spin-locking experiments. The true values of THF are significantly larger (by a factor of ca. 4) than those derived from a simple two-parameter fit of the CP behaviour with variable contact time. The temperature dependences of T-1(F) and T-1 rho(F) were measured between -49 and 86 degrees C. The relationship between the CP dynamics parameters and the local molecular motion in the polymer chains is discussed. Copyright (C) 1999 John Wiley & Sons, Ltd.
%0 Journal Article
%1 Ando1999b
%A Ando, Shinji
%A Harris, Robin K.
%A Monti, Gustavo A.
%A Reinsberg, Stefan A.
%D 1999
%J Magn. Reson. Chem.
%K 19F NMR,1H NMR,Abundant angle dynamics,Cross-polarization magic myown parameter spin,Cross-polarization spinning,Fluoropolymer,NMR,Relaxation
%N 10
%P 709--720
%R 10.1002/(SICI)1097-458X(199910)37:10<709::AID-MRC524>3.0.CO;2-G
%T Analysis of cross-polarization dynamics between1H and19F in Viton fluoroelastomer using solid-state19F magic angle spinning and1H →19F cross-polarization magic angle spinning NMR
%V 37
%X The cross-polarization dynamics between H-1 and F-19 in a Viton-type fluoroelastomer were studied using F-19 magic angle spinning (MAS) and H-1 F-19 cross-polarization (CP)/MAS NMR at 188.29 MHz. The phenomenological theory of spin thermodynamics based on the spin temperature hypothesis was employed to describe the polarization transfer between the H-1 and F-19 spin baths. Simultaneous fitting of the evolution of magnetization in the standard CP and a modified CP(TORQUE) experiment, using the exact solutions of the equations for the spin thermodynamics, gave unique sets of the parameters T-HF, T-1 rho(H) and T-1 rho(F) for five separate peaks in the F-19 spectra. The values of T-1 rho(H) and T-1 rho(F) obtained are consistent with those independently measured by spin-locking experiments. The true values of THF are significantly larger (by a factor of ca. 4) than those derived from a simple two-parameter fit of the CP behaviour with variable contact time. The temperature dependences of T-1(F) and T-1 rho(F) were measured between -49 and 86 degrees C. The relationship between the CP dynamics parameters and the local molecular motion in the polymer chains is discussed. Copyright (C) 1999 John Wiley & Sons, Ltd.
@article{Ando1999b,
abstract = {The cross-polarization dynamics between H-1 and F-19 in a Viton-type fluoroelastomer were studied using F-19 magic angle spinning (MAS) and H-1 F-19 cross-polarization (CP)/MAS NMR at 188.29 MHz. The phenomenological theory of spin thermodynamics based on the spin temperature hypothesis was employed to describe the polarization transfer between the H-1 and F-19 spin baths. Simultaneous fitting of the evolution of magnetization in the standard CP and a modified CP(TORQUE) experiment, using the exact solutions of the equations for the spin thermodynamics, gave unique sets of the parameters T-HF, T-1 rho(H) and T-1 rho(F) for five separate peaks in the F-19 spectra. The values of T-1 rho(H) and T-1 rho(F) obtained are consistent with those independently measured by spin-locking experiments. The true values of THF are significantly larger (by a factor of ca. 4) than those derived from a simple two-parameter fit of the CP behaviour with variable contact time. The temperature dependences of T-1(F) and T-1 rho(F) were measured between -49 and 86 degrees C. The relationship between the CP dynamics parameters and the local molecular motion in the polymer chains is discussed. Copyright (C) 1999 John Wiley {\&} Sons, Ltd.},
added-at = {2018-10-29T06:43:31.000+0100},
author = {Ando, Shinji and Harris, Robin K. and Monti, Gustavo A. and Reinsberg, Stefan A.},
biburl = {https://www.bibsonomy.org/bibtex/23f5d75e3e38e3ecb022fcd64b9f278c0/drsar},
doi = {10.1002/(SICI)1097-458X(199910)37:10<709::AID-MRC524>3.0.CO;2-G},
interhash = {036a27e7e22e2d5ca916c6f611470a02},
intrahash = {3f5d75e3e38e3ecb022fcd64b9f278c0},
issn = {07491581},
journal = {Magn. Reson. Chem.},
keywords = {19F NMR,1H NMR,Abundant angle dynamics,Cross-polarization magic myown parameter spin,Cross-polarization spinning,Fluoropolymer,NMR,Relaxation},
number = 10,
pages = {709--720},
pmid = {26690326},
timestamp = {2018-10-29T07:15:10.000+0100},
title = {{Analysis of cross-polarization dynamics between1H and19F in Viton fluoroelastomer using solid-state19F magic angle spinning and1H →19F cross-polarization magic angle spinning NMR}},
volume = 37,
year = 1999
}