5 , both melting point ( tm ) and isotropization temperature ( tj ) of all the three series compounds change regularly with the carbon numbers of the end alkoxy group increased . there is a gradual increase in smectic phase length and in the smectic - nemetic transition temperature . at the same time there is a gradual decrease in nemetic phase length 五，三个类型化合物16ia至16id 、 16ila至16lid 、 17ia至17id 、 17ila至17lid 、 18ia至18id和18ila至18lid的熔点和液晶态的清亮点均化合物分子中末端烷氧基增大逐渐降低；近晶相的温度范围和近晶相一向列相转变温度逐渐增大，而向列相的温度范围递减。
Our main conclusions are that surface polar interaction can give rise to a transition from a high temperature homogeneous alignment to a low temperature hometropic alignment , that if the strength of the surface polar interaction is weaker than the one of surface dispersion interaction , the homogeneous alignment of the nematic is always stable . part ii : a two - particle cluster theory is presented to study the effect of a solid bounding surface on the nlcs formed by polar molecules 获得的重要结论是：摩擦基板与液晶分子间的表面极性相互作用能引起基板间向列相液晶分子指向矢出现高温沿面到低温垂面的转变；当表面极性作用强度弱于表面色散作用强度时，基板间向列相液晶分子平行于基板的排列非常稳定。
In this paper , we study this problem by means of finite elements method . the main results as follow : ( 1 ) there is a discontinuity of the director field at the plate interfaces of the tile angle antisymmetric strong anchor nlc cell due to the presence of the kn surfacelike elastic term . the distribution of the director change regularly with different k ^ 当考虑表面弹性能项k _ ( 13 )项( k _ ( 13 ) 0 )时，得出的主要结果如下： ( 1 )在强锚定条件下，得到上下基板的倾角反对称向列相液晶盒系统中的指向矢分布曲线，曲线在边界处发生了很大的形变。
