以苯甲醛和2，6-二甲基苯胺为原料，经过一步法合成一种含四甲基结构的二胺单体d，a-（3，5-二甲基-4-氨基）苯基甲烷（BAY）P）。利用Yamazaki膦酰化法，将自制的二胺单体分别与对苯二甲酸、间苯二甲酸和二羧基联苯醚3种二酸单体经一步缩聚得到了3种新型可溶性芳香聚芳酰胺。结果表明，该聚芳酰胺的特性黏度在0．57～0．84dL／g之间，并表现出优异的溶解性能和光学性能，室温下不仅可以溶于高沸点的N-甲基-2一吡咯烷酮等溶剂中，还能溶于低沸点的氯仿等有机溶剂中，而且大部分该聚芳酰胺在这类溶剂中的溶解度可达10％（质量分数，下同）以上；所制得的聚芳酰胺薄膜颜色浅、透明性高，截断波长在312～345nm之间，500nm处的透过率均超过80％；该系列聚芳酰胺的玻璃化转变温度在338℃以上，空气和氮气中10％热失重时的温度在380℃和408℃以上；其薄膜的拉伸强度、断裂伸长率和弹性模量分别在64-81MPa、8．0％～9．2％和1．4～2．0GPa之间。%A diamine-type monomer, 3,3＇, 5,5 ＇-tetramethyl-4,4＇-diaminodiphenyl-butyltoluene （BADP）, was synthesized via a one-step reaction from 2,6-dimethylaniline and benzaldehyde. The obtained diamine was subsequently employed to prepare a series of aromatic polyamide via polycondensation with three aromatic diearboxylic acids by means of Yamazaki phosphorylation technique. It was found that the inherent viscosity of aromatic polyarnide was in range of 0. 57-0. 84 dL/g. They were readily soluble not only in some strong polar solvents such as N-methyl-2-pyrrolidone, but also in some low-boiling-point solvents such as chloroform with the maximum solubility more than 10 vet %. The polyamide films showed high optical transparency and colorless, with a UV-Vis absorption edge between 312 nm and 345 nrn. The temperature of 10% weight loss in air or nitrogen was higher than 380 ℃ and 408 ℃, respectively, and their glass-transition temperature were higher than 338 ℃. The polyamide films had tensile strength of 64-81 MPa, elongation at break of 8. 0 %-9.2 % , and module of 1.4-2.0 GPa.
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