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。然后，我们成功地在磁场作为外力的作用下，通过宏观LC定向产生了电各向异性和荧光二色性。(1)合成了新型的具有液态结晶性的芳香族共轭聚合物，聚对苯（PPP）、聚对苯乙烯（PPV）、聚噻吩（PT）和聚噻吩-乙烯（PTV）衍生物。(2)采用差示扫描量热仪（DSC）测量LC温度，偏光显微镜（POM）观察光学织构，x射线衍射（XRD）对LC相进行配位，明确LC共轭聚合物的高阶结构。(3)聚合物在LC相中通过磁力进行宏观排列。通过极化紫外-可见和红外吸收测量，评估了排列聚合物的光学二向色比，以掌握LC相有序参数的定量值。(4)用碘对排列聚合物进行化学掺杂，使其电导率增强，并产生电各向异性。(5)另一方面，对排列的聚合物进行荧光光谱测量，在发光中产生光学线性二色性。

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.