合成了两种具有氟取代的双苯环异硫氰酸酯(NCS)类液晶单体。通过与不含氟NCS单体的对比发现, 随着氟原子个数的增加单体的熔点逐渐降低, Δn值也逐渐降低, 其中二氟代双环NCS单体的Δn为0. 20。单氟代NCS单体混入商品液晶时具有提高其响应速度的特性, 而二氟代材料对于响应速度的提升不明显。实验结果表明, 单氟代双环NCS液晶是一种具有较高Δn、低熔点、低黏度的快速响应液晶材料, 在液晶空间光调制器件中具有一定的应用前景。

Two kinds of isothiocyanate(NCS)fluorinated LC materials with two benzene rings were prepared. The melting point andΔn of the NCS LC materials decreased along with the increase of fluorin number, theΔnof the LC with two fluorin atoms is only 0. 20. The NCS LC material with one fluorin could enhance the response performance by response time test when the commercial LC was mixed with this material. These data indicated that the NCS LC synthesized have high birefringence, low melting point and fast response properties, and would have some application potential in liquid crystal modulator of adaptive optics.