A series of polybenzimidazole was synthesized by the solution polycondensation reaction of 3,3´-diaminobenzidine (DAB) with dicarboxylic acid derivatives. The synthesized polybenzimidazoles were characterized by using IR, 1H-NMR, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA and DSC studies showed that the polybenzimidazoles have good thermal stability and are generally amorphous in nature. Glass transition temperature (Tg) values were found to be in the range of 300-410°C. This is the first detailed study to investigate the antimicrobial activities of the polybenzimidazoles. The synthesized polybenzimidazoles have high antimicrobial activity compared to benzimidazole molecules. It was also found that they are more effective against bacterial species than fungal species. The polymers 2, 5, 6, 7, having -1,3-phenyl, vinyl, -1-OH-3,5-phenyl and 4,4´- oxybisphenyl rings, showed remarkable activity against tested bacterial species (MIC = 32-500 μg/mL). Among these polymers, the polymers 6 and 7 having additional electronegative moiety have the highest activity against tested bacterial species.

通过3,3′-二氨基联苯胺（DAB）与二羧酸衍生物的溶液缩聚反应合成了一系列的聚苯并咪唑。合成的聚苯并咪唑通过IR，1 H-NMR，热重分析（TGA）和差示扫描量热法（DSC）进行表征。TGA和DSC研究表明，聚苯并咪唑具有良好的热稳定性，并且通常是无定形的。发现玻璃化转变温度（Tg）值在300-410℃的范围内。这是第一个研究聚苯并咪唑类抗菌活性的详细研究。与苯并咪唑分子相比，合成的聚苯并咪唑具有较高的抗菌活性。还发现它们对细菌物种比真菌物种更有效。具有-1的聚合物2、5、6、7，3-苯基，乙烯基，-1-OH-3,5-苯基和4,4′-氧代双苯基环对被测细菌具有显着活性（MIC = 32-500μg/ mL）。在这些聚合物中，具有附加的负电性部分的聚合物6和7对被测细菌具有最高的活性。