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Optical and electro-optic properties of two highly conjugated diphenyldiacetylenic liquid crystals (LCs) [1.4-bis-(4-propylphenyl)-butadiyne, abbreviated as PTTP-mm] and their eutectic mixture were characterized in the nematic range. These LCs are found to exhibit extraordinarily high birefringence and very low viscoelastic coefficient. Their figure of merit is significantly higher than that of the widely used commercial LC mixture BDH-E7. Potential application of PTTP-mm in modulating infrared radiation is addressed.
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Wu et al. (1989) studied this question.
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