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S. Lecommandoux F. Hardouin A.J. Dianoux 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,5(1):79-85
From quasi-elastic neutron scattering experiments performed in glassy, nematic and isotropic phases, the dynamics of oriented
samples of strong anisotropic side-on fixed liquid crystal polymers have been analysed. Using the selective deuteration method,
we are able to attribute motions to specific parts of the molecule in the parallel and perpendicular orientations. The motions
of the whole macromolecule decrease as soon as the temperature decreases below the isotropic-nematic transition. Nevertheless,
the motions of the polymer backbone, compared to the whole polymer dynamics, are systematically reduced, even in the isotropic
phase. Moreover, an anisotropy of the motions is revealed, with a reduction in the direction parallel to the orientation.
An harmonic character of the vibrational processes is also evidenced. We conclude that the anisotropy of the dynamic corroborates
the anisotropy of conformation of the macromolecule (so-called jacketed structure).
Received: 29 October 1997 / Revised: 22 January 1998/
Accepted: 11 May 1998 相似文献
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CM Silva MF Duarte ML Mira MH Florêncio K Versluis AJ Heck 《Rapid communications in mass spectrometry : RCM》1999,13(12):1098-1103
Fast atom bombardment, combined with high-energy collision-induced tandem mass spectrometry, has been used to investigate gas-phase metal-ion interactions with captopril, enalaprilat and lisinopril, all angiotensin-converting enzyme inhibitors.Suggestions for the location of metal-binding sites are presented. For captopril, metal binding occurs most likely at both the sulphur and the nitrogen atom. For enalaprilat and lisinopril, binding preferably occurs at the amine nitrogen. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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