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Dissertation angenommen durch: Universität Duisburg-Essen, Campus
Duisburg, Fakultät für Naturwissenschaften, Institut für Chemie,
2003-05-14
BetreuerIn: Prof. Dr. Wiebren S. Veeman , Universität Duisburg-Essen, Campus Duisburg, Fakultät für Naturwissenschaften, Institut für Chemie
GutachterIn: Prof. Dr. Wiebren S. Veeman , Universität Duisburg-Essen, Campus Duisburg, Fakultät für Naturwissenschaften, Institut für Chemie
GutachterIn: Prof. Dr. Christian Mayer , Universität Duisburg-Essen, Campus Duisburg, Fakultät für Naturwissenschaften, Institut für Chemie
Schlüsselwörter in Englisch: Clathrates, Line shape simulation
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Abstrakt in Englisch
The crystalline regions of the δ-form of syndiotactic polystyrene
(s-PS) contain cavities in which certain small molecules can be
absorbed. The mobility of six perdeuterated molecules: benzene,
toluene, chloroform dichloromethane, 1,2-dichloroethane and
1,2-dibromoethane, present as a guest in these cavities, has been
investigated via 2H NMR spectroscopy. For all samples the motional
behavior of the molecules absorbed in the amorphous phase of the
polymer differs from that shown by the molecules clathrated in the
crystalline phase. The motion of all six molecules in the amorphous
phase is approximately isotropic at a temperature T = 298 K or higher,
but severely anisotropic when the molecules are included in the
crystalline phase. The dynamical behavior of each solvent hosted in the
crystalline phase of s-PS has been investigated by comparing spectra
obtained by simulation of the effect of a certain molecular rotation on
the 2H spectra with the experimental spectra.
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