硅氧烷近晶相单体的合成及应用

为了改善聚合物分散液晶（PDLC）在智能玻璃领域应用中存在的视角较差、透明态效果不够理想以及无法实现双稳态的缺点，合成了一种具有硅氧烷长链结构的近晶相液晶单体，并将该近晶相液晶单体用于近晶相的混晶配方制备了简单的近晶相双稳态器件。以10-溴-1-癸烯、对羟基联苯氰和1,1,1,3,3,5,5-七甲基硅氧烷为原料，以较高收率合成了该近晶相液晶单体。通过核磁共振（NMR）和元素分析（EA）确认了分子结构的正确性；利用偏光显微镜（POM）、示差扫描量热仪（DSC）等对其单体液晶参数和混晶配方参数进行测定，通过基板处理、液晶盒制备、器件老化等过程制备了近晶相双稳态器件。实验表明，该近晶相混晶配方制得的近晶相双稳态器件具有较宽的近晶相温宽（-62℃~60℃），较低的驱动电压（50 V），透明态参数优秀（雾度=0.06%，平行光透过率=90.34%），完全无视角缺陷，且可以仅在状态切换时需要通电实现双稳态效果。该硅氧烷类近晶相液晶单体对于改善近晶相混晶配方有着重要的作用，该材料制备方法简单，原料易得，收率较高，易于生产，对于智能玻璃领域的市场推广有着重要的作用。

Synthesis and application of organosiloxane smectic liquid crystals

In order to improve the view angle,the haze of clear state and the bistable property of smart window by polymer dispersed liquid crystal(PDLC), we have synthesized an organosiloxane smectic liquid crystal with long carbon chain and prepared simple optical bistable device by using this material. This oganosiloxane smectic liquid crystal was synthesized from 10-bormodec-1-ene,4'-hydroxybiphenyl-4-carbonitrile and 1,1,1,3,3,5,5-heptamethyltrisiloxane in high yield. The molecular structure was confirmed by nuclear magnetic resonance (NMR) and elemental analysis (EA). We also measured the parameters and the performances of this compound and the liquid crystal mixture by polarizing optical microscope(POM) and differential scanning calorimetry (DSC). Simple optical bistable device was prepared by several steps including substrate surface treatment, preparation of liquid crystal cell, aging of the cell and so on. This optical bistable device has wide smectic phase temperature range (-62℃~60℃), low driving voltage(50 V), excellent parameters at clear state(haze=0.06%,parallel light transmittance=90.34%), good view angle and bistable property only need to be electrified when switching the state. This organosiloxane smectic liquid crystal can be used to improve the parameters of the smectic liquid crystal mixture. The preparation method is simple and economical, which can also realize industrialization easily and plays an important role to promote the popularization of smart glass market.