Synthesis and Properties of Multi-functional Conjugated Polymers with Electrical Conductivity, Optical Luminescence, and Liquid Crystallinity

通过在侧链中引入液晶基团，合成了具有液晶性的多功能共轭聚合物。(1)合成了具有液晶性的新型芳香族共轭聚合物：聚对苯撑(PPP)、聚对苯乙撑(PPV)、聚噻吩烯(PT)和聚亚硫乙烯(PTV)衍生物。(2)用差示扫描量热仪(DSC)测量液晶温度，用偏光显微镜(POM)观察光学织构，并通过X射线衍射仪对液晶相进行了指认，明确了层叠式液晶共轭聚合物的高阶结构。(3)聚合物通过液晶相中的磁场力进行宏观取向。通过偏振紫外可见吸收光谱和红外吸收光谱对取向聚合物的光学二向色性进行了评价，以掌握液晶相有序参数的量化值。(4)用碘对取向聚合物进行化学掺杂，提高了电导率，产生了电各向异性。(5)另一方面，对取向聚合物进行了荧光光谱测量，得到了发光的光学线性二色性。

We synthesized multi-functional conjugated polymers with liquid crystallinity by introducing liquid crystalline (LC) groups into side chains. Then we succeeded in generating electrical anisotropy and fluorescent dichroism through macroscopic LC alignment under magnetic field used as an external furce.(1) Novel aromatic conjugated polymers with liquid crystallinity, poly-para-phenylene (PPP), poly-para-phenylene vinylene (PPV), polythiophene (PT), and polythienylene vinylene (PTV) derivatives have been synthesized.(2) Measurement of LC temperatures by differential scanning calorimeter (DSC) , observation of optical textures by polarizing optical microscope (POM), and assignment of LC phases by X-ray diffraction (XRD) were carried out to clarify higher order structures of stacked LC conjugated polymers.(3) The polymers are macroscopically aligned through magnetic force in LC phase. The optical dichroic ratios of the aligned polymers were evaluated by polarized UV-Vis and IR absorption measurements, in order to grasp quantitative values of order parameters of LC phases.(4) The aligned polymers were chemically doped using iodine, resulting in enhancement of electrical conductivity and generation of electrical anisotropy.(5) On the other hand, the aligned polymers were subjected to fluorescence spectroscopic measurement, giving rise to optically linear dichroism in luminescence.