Polybenzimidazoles with three different network structures are synthesized by condensation polymerization between the conventional monomer 3,3’-Diaminobenzidine and three different acid monomers. The synthesised polymer networks are characterized using several characterization techniques such as FT-IR, powder XRD, HR-SEM and TG-DTA analyses. The polybenzimidazoles are amorphous in nature with excellent thermal stability up to 450 ºC. The photophysical properties of polybenzimidazoles are studied using UV-visible absorption and Emission spectral techniques. Further, the excited state photoluminescence decay time measurement shows a functional group dependant decay behaviour. All the three polymers display narrow optical band gap energy and could be applied as a material for solar energy conversion and semiconductors.

通过常规单体3,3'-二氨基联苯胺与三种不同酸单体的缩聚反应，合成了具有三种不同网络结构的聚苯并咪唑。合成的聚合物网络使用多种表征技术进行表征，例如 FT-IR、粉末 XRD、HR-SEM 和 TG-DTA 分析。聚苯并咪唑本质上是无定形的，在高达 450 ºC 时具有出色的热稳定性。使用紫外-可见吸收和发射光谱技术研究了聚苯并咪唑的光物理性质。此外，激发态光致发光衰减时间测量显示了依赖于官能团的衰减行为。这三种聚合物都显示出窄的光学带隙能量，可以用作太阳能转换和半导体材料。