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Reorientation of a liquid crystalline side‐chain polymer in electric and magnetic fields investigated by solid‐state 1 H‐NMR
Author(s) -
Holstein Peter,
Bender Michael,
Winkler Mario,
Geschke Dieter
Publication year - 1998
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(1998100)9:10/11<659::aid-pat829>3.0.co;2-m
Subject(s) - electric field , materials science , spectrometer , magnetic field , electromagnetic coil , liquid crystal , side chain , nuclear magnetic resonance , polymer , phase (matter) , capacitor , condensed matter physics , field (mathematics) , chemical physics , optics , optoelectronics , physics , chemistry , voltage , composite material , organic chemistry , mathematics , quantum mechanics , pure mathematics
With a capacitor placed in the radio frequency coil of an nuclear magnetic resonance spectrometer it is possible to investigate reorientational processes in liquid crystalline polymers induced by the static magnetic field of the spectrometer and a dynamic electric field between the capacitor plates. In the nematic phase, the alignment of the director is a result of the interplay between two competing fields. The director can be rotated in every desired angle by the simultaneous application of the electric field. The dynamics of the process depends strongly on the strength of the electric field and on the temperature. The arrangement allows the in situ measurement of switching times, of the rotational vicosity γ 1 , etc. © 1998 John Wiley & Sons, Ltd.