Mixtures calculated nematic range

In order to widen the nematic range of the monomers and to decrease their melting temperatures, we have made binary mixtures of compounds n = 0 and n = 1 (Table l). We observed that the experimental diagram did not exhibit an eutectic, as is generally observed with other liquid crystals. The two compounds are probably miscible in all proportions in their crystalline state (solid solution). The phase diagrams, experimental and calculated, are plotted on Figure 1. 

The oscillations of I (U) are well seen in the experimental plot. Fig. 11.21. The measurements were made at 27°C on 55 nm thick cell filled with a mixture having ta = 22. From the I (U) curve, the field dependence of the phase retardation 8(17) and the Frederiks transition threshold Uc were obtained. In mm, from Ec = UJd and Fq. (11.56) the splay elastic constant Ku was found. The bend modulus "33 was calculated from the derivative dbldU. The same material parameters may be found for the whole temperature range of the nematic phase. 

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