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Dynamic Investigation in a Nematic Mixture with High Glass‐Transition Temperature

1990; Volume: 94; Issue: 12 Linguagem: Inglês

10.1002/bbpc.199000062

0005-9021

H. Kresse, S. Ernst, W. Wedler, D. Demus, F. Kremer,

Molecular spectroscopy and chirality

Abstract Wörter Dielectric measurements have been performed on oriented samples of a nematic mixture with a glass‐transition temperature of about 285 K in a frequency range between 0.1 and 10 6 Hz and on unoriented, quenched samples of this mixture from 156 K up to 300 K. Rotations around the short and long molecular axis gave a Vogel‐Fulcher‐Tammann‐behaviour; the seperate rotation of polar end‐groups caused the appearance of a high‐frequency‐Arrhenius‐like mechanism which was observable at very low temperatures.