Synthesis and properties of some novel high birefringence phenylacetylene liquid crystal materials with lateral substituents
Synthesis and properties of some novel high birefringence phenylacetylene liquid crystal materials with lateral substituents
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DOI：
10.1080/02678290110059479
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发表时间：
2001-09
期刊：
影响因子：
2.2
通讯作者：
C. Sekine;K. Iwakura;Naoto Konya;Masayoshi Minai;Koichi Fujisawa
中科院分区：
文献类型：
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作者：
C. Sekine;K. Iwakura;Naoto Konya;Masayoshi Minai;Koichi Fujisawa
我们合成并研究了具有高双折射值（Δn）的新型三环苯乙炔液晶，以改善液晶的双折射温度范围，同时保持高的光学各向异性。在修饰末端环的情况下，引入支链烷氧基链、氟或甲基使双相转移到较低的温度。为了尽量减少取代基对Δn的影响，侧甲基的引入被选为获得宽的和低温的结晶相的最有利的方法。考虑到这些结果，我们研究了甲基位置对物理性质的影响。甲基位置对提高分子筛的结晶温度范围最有效的是在中心环上。从获得高Δn值和低粘度的角度来看，中心环也是最佳位置。
We have synthesized and investigated new 3-ring phenylacetylene liquid crystals with high birefringence values (Δn) to improve the nematic temperature range while retaining a high optical anisotropy. In the case of modifying the terminal ring, the introduction of branched alkoxy chains, fluorine or methyl groups shifted the nematic phase to lower temperatures. In order to minimize the influence of the substituent on Δn, the incorporation of lateral methyl groups was chosen as the most profitable method for obtaining wide and low temperature nematic phases. With these results in mind, we studied the effect of the position of the methyl group on the physical properties. The most effective methyl position for improving the nematic temperature range was on the central ring. From the standpoint of obtaining high Δn values and low viscosity, the central ring was also the best position.