2,5-Bis(4-(2-aminothiazole) phenyl)-3 and 4-diphenyltetraphenyl thiophene (TPTPThDA) are fine processed in three steps. A series of polyazomethines containing thiophene–thiazole unit have been incorporated by the polycondensation of a new diamine, i.e. TPTPThDA, with proportionate of aromatic dialdehydes. The impact of insertion of thiazole entity in the polyazomethine matrix with the azo linkages having dialdehydes [isophthalaldehyde (1,3 IPA) and terephthalaldehyde (1,4 TPA)], on conductivity and gas sensing properties, has been studied. In all polyazomethines synthesized (PAM-01 to PAM-05), the preeminent in terms of conductivity and gas sensing properties has been established to be the PAM-03 containing polyazomethine matrix composition of 1,3 IPA and 1,4 TPA with thiophene–thiazole unit. After the infusion with the dialdehyde comonomers, an inflation of the molecular weight and the polyazomethines films were highly selective towards H 2 S gas at 35 °C with great sensitivity and acceptable selectivity. Along this, all polyazomethines have T g in the range of 257–260 °C and T 10% value of all thermally stable polyazomethines in air and nitrogen was in between of 458–545 °C and 527–601 °C, respectively. The polymer backbone contains rigid framework expect PAM-05, and due to this, they show less solubility in organic solvents. XRD study confirms that all the polyazomethines are amorphous in nature having broad peak in the range of 20°. The UV at 342 nm shows that there is a formation of imine (–C=N–) linkages in the polymer matrix which is helpful for the conduction of electron throughout. The band gap energy of PAM-3 is found as 3.63 eV.

中文翻译：

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四苯基噻吩-噻唑基 π 共轭聚偶氮甲碱：合成、表征和气敏应用

2,5-双(4-(2-氨基噻唑)苯基)-3和4-二苯基四苯基噻吩(TPTPThDA)分三步精加工。一系列含有噻吩 - 噻唑单元的聚偶氮甲碱已通过新二胺（即 TPTPThDA）与成比例的芳族二醛缩聚而加入。已经研究了噻唑实体在具有二醛 [间苯二甲醛 (1,3 IPA) 和对苯二甲醛 (1,4 TPA)] 的偶氮键的聚偶氮甲碱基质中插入对电导率和气敏特性的影响。在所有合成的聚偶氮甲碱（PAM-01 到 PAM-05）中，在导电性和气敏特性方面的卓越表现被确定为 PAM-03，其中含有 1,3 IPA 和 1,4 TPA 与噻吩的聚偶氮甲碱基质组合物——噻唑单元。在注入二醛共聚单体后，分子量的膨胀和聚偶氮甲碱薄膜在 35 °C 下对 H 2 S 气体具有高度选择性，具有很高的灵敏度和可接受的选择性。沿此，所有聚偶氮甲碱的 Tg 范围为 257–260 °C，空气和氮气中所有热稳定聚偶氮甲碱的 T 10% 值分别介于 458–545 °C 和 527–601 °C 之间。除了 PAM-05 之外，聚合物主链包含刚性骨架，因此，它们在有机溶剂中的溶解度较低。XRD 研究证实所有聚偶氮甲碱本质上都是无定形的，在 20° 范围内具有宽峰。342 nm 处的 UV 显示聚合物基质中形成了亚胺 (–C=N–) 键，这有助于电子的传导。PAM-3 的带隙能量为 3.63 eV。