Fluorescence study of a field-induced director reorientation in a liquid crystalline polyacrylate

1991 ◽  
Vol 1 (1) ◽  
pp. 69-76
Author(s):  
M. Van Damme ◽  
J. Hofkens ◽  
F. C. De Schryver ◽  
T. G. Ryan
Keyword(s):  
Liquid Crystalline ◽  
Fluorescence Study ◽  
Director Reorientation

Fluorescence study on a liquid-crystalline polyester containing naphthoate mesogen units

2000 ◽  
Vol 38 (22) ◽  
pp. 2922-2928 ◽  
Author(s):  
Yuka Uchida ◽  
Hsu Wen Huang ◽  
Kazuyuki Horie ◽  
Liu Yu Qing ◽  
Hitoshi Tuchiya ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Fluorescence Study ◽  
Liquid Crystalline Polyester

Fluorescence study of field-induced director reorientations in low mass liquid crystalline compounds

1991 ◽  
Vol 1 (3) ◽  
pp. 193-202 ◽  
Author(s):  
J. Hofkens ◽  
M. Van Damme ◽  
F. C. De Schryver ◽  
T. G. Ryan
Keyword(s):  
Liquid Crystalline ◽  
Fluorescence Study ◽  
Low Mass

FT-IR Study of the Electric Field Modulation of Liquid Crystalline 5CB

1996 ◽  
Vol 50 (2) ◽  
pp. 167-173 ◽  
Author(s):  
J. de Bleijser ◽  
L. H. Leyte-Zuiderweg ◽  
J. C. Leyte ◽  
P. C. M. van Woerkom ◽  
S. J. Picken
Keyword(s):  
Liquid Crystalline ◽  
Modulation Frequency ◽  
Static Field ◽  
Transition Range ◽  
Polar Orientation ◽  
Ft Ir ◽  
Field Modulation ◽  
Ir Study ◽  
Director Reorientation ◽  
Quadrature Signals

The dynamic IR spectra of electrically modulated liquid crystalline 5CB (4-pentyl-4'-cyanobiphenyl) are determined to be due to the director reorientation. In the absence of dc fields, the IR response is mainly at two times the modulation frequency. IR signals at the modulation frequency may be induced by application of additional dc fields. These signals at the modulation frequency are caused by the creation of polar orientation due to the static field. No difference in dynamic response has been found between the rigid aromatic core and the pentyl chain of 5CB. Expressions are given for the in-phase and in-quadrature signals at the modulation frequency and at twice its value. It is shown that the frequency-domain dynamic IR experiment mainly probes the transition range between the uniform planar to the homeotropic regions in the sample. The different probing of the sample by time-domain experiments is briefly discussed.

Highly efficient optical director reorientation of liquid-crystalline polymer induced by dye additives

2017 ◽  
Vol 95 (5) ◽  
Author(s):  
I. A. Budagovsky ◽  
V. N. Ochkin ◽  
S. A. Shvetsov ◽  
A. S. Zolot'ko ◽  
A. Yu. Bobrovsky ◽  
...  
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Highly Efficient ◽  
Director Reorientation

Liquid crystalline elastomers as artificial muscles

e-Polymers ◽  
2001 ◽  
Vol 1 (1) ◽  
Author(s):  
Hendrik Wermter ◽  
Heino Finkelmann
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Side Chain ◽  
Artificial Muscles ◽  
Chain Polymer ◽  
Mechanical Field ◽  
Crosslinking Process ◽  
Director Reorientation ◽  
Main Chain Polymers ◽  
Reorientation Process

AbstractNew nematic co-elastomers were synthesized which consist of a combination of nematic side- and main-chain polymers and where the liquid crystalline main-chain polymer can be considered as a macromolecular crosslinking component. By applying a mechanical field during the crosslinking process, the director of the nematic phase becomes macroscopically uniformly aligned and liquid-single-crystal elastomers were obtained. Within a narrow temperature regime, these networks can change their shape in one dimension by a factor > 3 and considerably improve the ability of being used as artificial muscles or mechanical actuators compared to the well known nematic side-chain elastomers. Networks having a non-ordered polydomain structure exhibit “soft (or semi-soft) elasticity” which is not only determined by a director reorientation process. Obviously, hairpin conformations within the main-chain segments contribute to this effect.

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