Structural Control of Liquid Crystalline Polymers Having Non-Linear Optical Property.

以五氟苯酚和氯仿的混合溶液为溶剂，采用溶液浇铸法制备了4-羟基苯甲酸（HBA）和2-羟基-6-萘甲酸（HNA）共聚酯液晶薄膜。研究了这些薄膜的相变和结构。在这项研究中，这些共聚物薄膜在拉伸过程中的精细结构的变化进行了检查有关的共聚物组合物。在室温和150℃（>Tg）下以2 mm/min拉伸薄膜。膜表现出透明的，无论共聚物的组成。拉伸后保持了薄膜的透明性。与其它膜相比，具有HBA=55摩尔%的膜的拉伸伸长率更高。在150℃下拉伸的膜的伸长率约为600%。该共聚物在顺磁状态下具有磁性取向，且共聚物链与磁场方向平行。富含HBA的共聚物取向系数高 关于我们 在整个温度范围内都比其他的要高。共聚物的磁性取向优先依赖于凝固结构的大小，它们的粘度，和熔体中的热波动。在3 T的磁场下进行了共聚物的流延成膜过程，发现不同的共聚物组成都能得到取向膜。高含量HNA的共聚物的双折射率较高。HNA的高磁化率对共聚物在溶液浇铸体系中的取向是有效的。此外，液晶树枝状大分子和液晶杯芳烃的结构控制进行了检查。结果发现，液晶树枝状大分子自发地形成了一个垂直取向的近晶A。他们表现出高度取向的近晶结构下的磁场为2.7 T。因此，这些取向方法是有效的液晶聚合物材料的结构控制。少

Thin films of liquid crystalline copolyesters composed of 4-hydroxy benzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) were prepared by solution-casting method using a mixed solution of pentafluorophenol and chloroform. The phase transitions and structures of these films has been investigated. In this study, the fine structural changes of these copolymer films during drawing process were examined in relation to copolymer composition. The films were drawn at 2mm/min at room temperature and 150℃(>Tg). The films exhibited transparent in spite of copolymer composition. The transparency of films was kept after drawing. The tensile elongation of the film with HBA=55 mol% was higher as compared with other films. The elongation of the film drawn at 150℃ was approximately 600%. The copolymer exhibited a magnetic orientation at the nematic state, and the copolymer chain was parallel to the direction of the magnetic field. The orientation coefficients of the copolymer with rich HBA were high … More er than others in the whole temperature range. The magnetic orientation of the copolymers preferentially depend on the size of coagulate structures, their viscosity, and thermal fluctuation in the melts. The film-casting procedure of the copolymers was carried out under a magnetic fields of 3T.The oriented films could be prepared in spite of different copolymer compositions. The birefringence of the copolyner with rich HNA is higher than others. The high magnetic susceptibility of HNA was effective on the orientation of the copolymers in the solution-casting system. Moreover, the structural control of liquid crystalline dendrimers and liquid crystalline calixarenes was examined. It was found that the liquid crystalline dendrimer spontaneously formed a homeotropic orientation in the smectic A.They exhibited highly oriented smectic structures under the magnetic field of 2.7 T.As a result, these orientation methods are effective on the structural control of liquid crystalline polymer materials. Less