向列相液晶旋转黏度测试方法的研究

Method of Measuring Nematic LC Rotational Viscosity

文章总结了液晶旋转黏度的几种测试方法,分析了其各自的优缺点。根据瞬态电流法得到了混合液晶的旋转黏度值,通过对目前正性液晶材料的Δε测试方法进行改良和优化得到了准确的混合液晶旋转黏度值。提出了单体液晶分子旋转黏度的拟合方法。测试了液晶的旋转黏度和介电常数随温度变化的趋势。总结了不同结构单体液晶旋转黏度和介电常数的关系。

This paper introduced several methods of measuring rotational viscosity of nematic liquid crystal, and analyzed the characteristic of each. According to the method of transient current, the rotational viscosity of nematic LC mixture has been gotten. Through improving the method of measuring dielectric constant A~ of liquid crystal, rotational viscosity of LC mixture can be measured exactly. The changing line between A~ and rotational viscosity have been measured. A method for calculating the rotational viscosity of LC monomer was sup- plied. The relations of rotational viscosity and dielectric constant of liquid crystal monomer with different structures were summarized.