Orientation in liquid crystal

The parallel arrangement of dendrons on the polymer backbone is also attractive for surface orientation in liquid crystal displays. 

The combination of the stabilization effect by molecular orientation in liquid crystals, the geometry effect, and the relatively strong bonding energy of the carboxylic acid/pyridine interaction, leads to the formation of supramo-lecular liquid-crystalline materials which exhibit stable mesomorphic behavior. The stability and molecular orientation for H-bonded systems have been discussed theoretically [72-74]. 

The same principle, but applied to UV spectra, has been exploited for measuring orientation in liquid crystal polymers by groups in Germany and the USSR. ... 

In summary, wide-angle X-ray scattering offers an almost unique opportunity to assess properly the molecular segmental orientation in liquid crystal polymers, by providing both orientational parameters and a structural model of the orienting unit. Furthermore, it is possible to obtain some information as to the level of local orientation, in contrast to the macroscopic or global orientation normally quoted. 

Shirakawa polyacetylene oriented in liquid-crystal matrix [17b] 1600 1.10 (0.50) 1750... 

The reader is directed elsewhere for a more detailed discussion of the use of x-ray Scattering procedures to evaluate the level of preferred orientation in liquid crystal polymers [1]. 

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