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

具有非线性光学性质的液晶聚合物的结构控制。

基本信息

批准号：
11650918
负责人：
YONETAKE Koichiro
金额：
$ 2.11万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

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

以五氟酚和氯仿的混合溶液为原料，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)组成的液晶共聚酯薄膜。研究了这些薄膜的相变和结构。在这项研究中，考察了这些共聚物膜在拉伸过程中的精细结构变化与共聚物组成的关系。薄膜的拉伸速度为2 mm/℃，室温下为150Tg。尽管有共聚物组成，但薄膜仍表现出透明。拉伸后薄膜的透明度保持不变。HBA=55mol%的薄膜的拉伸伸长率高于其他薄膜。在150℃拉伸时，薄膜的延伸率约为600%。共聚物在向列相时呈磁取向，共聚物链平行于磁场方向。富含HBA的共聚物的取向系数较高，为…在整个温度范围内比其他温度范围内的其他温度更高。共聚物的磁取向优先取决于凝聚结构的大小、它们的粘度和熔体中的热波动。在磁场为3T的条件下进行了共聚物的成膜过程，不同组成的共聚物均可制备出定向薄膜。富含海航的共聚体的双折射比其他共聚物高。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，还考察了液晶树枝状大分子和液晶杯芳烃的结构控制。结果表明，在2.7T的磁场作用下，液晶树枝状大分子在近晶A中自发形成向同性取向，并呈现高度取向的近晶结构。因此，这些取向方法对液晶高分子材料的结构控制是有效的。较少