含液晶基团的聚对亚苯基亚乙炔基类交替共聚物的合成、表征及性能研究

合成了两种含氰基联苯液晶基团的新型聚对亚苯基亚乙炔基(PPE)类交替共聚物,并对其进行了结构表征和性能研究.示差扫描量热仪(DSC)和偏光显微镜(POM)的结果证明了在液晶单元含量较大时聚合物才会出现明显的液晶形态.荧光光谱表明,在降温前后液晶聚合物的发光光谱发生了明显的变化.同时,对聚合物进行能量转移研究发现随着溶液浓度的增加,Frster能量转移更加完全;另外,利用原子力显微镜(AFM)对聚合物降温前后的形态变化进行了观察.结果表明,液晶性质可以导致聚合物形态的变化进而带来发光光谱的改变,为今后制备液晶可控型发光聚合物提供了理论依据.

SYNTHESIS,CHARACTERIZATION AND PROPERTIES OF POLY(p-PHENYLENEETHYNYLENE)CONJUGATED POLYMERS CONTAINING LIQUID CRYSTAL GROUPS

Two novel(poly(p-phenyleneethynylene))(PPE) samples with liquid crystal (LC)groups were synthesized,and their liquid crystal properties and photoluminescent properties were investigated.It was found that the LC properties of these polymers were deeply affected by the density of the side-chain LC groups,and the polymer with high content of LC groups exhibited the obvious smectic mesophase as illustrated by differential scanning calorimetry and polarized optical microscopy.The photoluminescence spectra showed that there was a remarkable change for the LC polymer in the solid film state before and after annealing,likely attributed to the morphological change by thermal annealing.Additionally,Frst energy transfer in the concentrated solution was also reported.Moreover,atom force microscope(AFM) images were investigated with the temperature changing.As a result,we concluded that spectra can be altered by the conjugated polymer morphologies with different LC states,and this provided us a promising aspect for the future preparation of controlled light emitting polymers.