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合成3,5-双(4-氨基苯氧基)苯甲酸(35BAPBA)。其方法为3,5-二羟基苯甲酸(35DHBA)和对氯硝基苯(PCNB)通过缩合反应,合成得到了3,5-双(4-硝基苯氧基)苯甲酸(35BNPBA);然后,进一步还原,得到3,5-双(4-氨基苯氧基)苯甲酸(35BAPBA),基于35BAPBA单体,制得多种结构的含羧基芳香族聚酰亚胺薄膜,并对这些薄膜的性能进行研究。制得的3,5-双(4-氨基苯氧基)苯甲酸(35BAPBA)的熔点为245.8℃,且纯度高。各类薄膜的透过率均可达80%以上,具有良好的紫外吸收性能;吸水性均小于3%,具有优异的疏水性能;其拉伸强度在15~56MPa之间。
3,5-bis (4-aminophenoxy) benzoic acid (35BAPBA) was synthesized. The method is that 3,5-bis (4-nitrophenoxy) benzoic acid (35BNPBA) is synthesized through the condensation reaction of 3,5-dihydroxybenzoic acid (35DHBA) and p-chloronitrobenzene (PCNB) Then, further reduction to give 3,5-bis (4-aminophenoxy) benzoic acid (35BAPBA) based on 35BAPBA monomer, to obtain a variety of structural carboxyl-containing aromatic polyimide film, and these films The performance of the study. The obtained 3,5-bis (4-aminophenoxy) benzoic acid (35BAPBA) had a melting point of 245.8 ° C and high purity. All kinds of film transmittance up to 80%, with good UV absorption properties; water absorption of less than 3%, has excellent hydrophobic properties; tensile strength between 15 ~ 56MPa.