ABSTRACT Novel aromatic aliphatic diacid monomer, 4 4ʹ bis(4-carboxy methylene) biphenyl was synthesized via friedel craft acylation with acetic anhydride followed by willgerodot reaction and used in the preparation of polyamides by direct polycondensation using the Yamazaki phosphorylation reaction with commercial aromatic diamines. These polyamides were obtained in good yield with moderate-to-high-molecular-weight build up as evidenced by inherent viscosities in the range of 0.52–0.96 dlg−1. The XRD studies showed that all the polyamides were amorphous in nature and these polymers dissolved in polar aprotic solvents such as N-methyl-2-pyrrolidone(NMP),N,N-dimethylsulfoxide(DMSO), N,N-dimethyl formamide (DMF) and N,N-dimethyl acetamide. The resulting polyamides were characterized by inherent viscocity measurements, FT-IR, 1H NMR and 13C NMR spectroscopy, solubility, thermogravimetry, X-ray diffraction studies. These polyamides had glass transition temperatures between 210°C and 261°C, and their temperatures at a 10% weight loss were 620 to 710°C and 497 to 597°C in nitrogen and air atmospheres, respectively, which indicates thermally stable polymers.

中文翻译：

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4 4′双（4-羧基亚甲基）联苯和各种二胺衍生的新型聚酰胺的合成、表征和性能

摘要 新型芳香族脂肪族二酸单体 4 4ʹ 双（4-羧基亚甲基）联苯是通过与乙酸酐进行弗里德尔工艺酰化，然后进行 Willgerodot 反应合成的，并用于通过使用山崎磷酸化反应与商业芳香二胺直接缩聚制备聚酰胺。这些聚酰胺以良好的产率获得，具有中等至高分子量，其固有粘度在 0.52-0.96 dlg-1 范围内。XRD 研究表明所有聚酰胺本质上都是无定形的，这些聚合物溶解在极性非质子溶剂中，如 N-甲基-2-吡咯烷酮 (NMP)、N,N-二甲基亚砜 (DMSO)、N,N-二甲基甲酰胺 (DMF) ) 和 N,N-二甲基乙酰胺。所得聚酰胺的特征在于固有粘度测量、FT-IR、1H NMR 和 13C NMR 光谱、溶解度、热重分析、X 射线衍射研究。这些聚酰胺的玻璃化转变温度在 210°C 至 261°C 之间，在氮气和空气气氛中，重量损失 10% 的温度分别为 620 至 710°C 和 497 至 597°C，这表明聚合物具有热稳定性。