In this paper, diamine monomers with ether bonds in the main chain are selected for molecular structure design, and four polyamide-imide (PAI) materials are prepared by the acyl chloride method. A diamine monomer containing an ether group can reduce the friction coefficient and improve the wear performance of PAI material. The wear mechanism of PAI material can also change due to ether linkages. PAI synthesized using m-phenylenediamine without an ether bond has the highest friction coefficient and abrasion loss, and the wear mechanism is mainly adhesive wear. With the increase of the number of ether bonds in the diamine monomer structure, the friction coefficient of the material decreases from 0.5445 to 0.4216 (22.57 %). The abrasion loss of the PAI material synthesized using 4,4′-diaminodiphenyl ether is the smallest, which is 84.4 % lower than m-phenylenediamine. The wear mechanism is abrasive wear and slight adhesion wear. With the increase of the number of ether bonds, the heat r esistance of PAI decreases slightly, while the hydrophobic property increases and the water absorption decreases. To summarise, PAI material synthesized using 4,4′-diaminodiphenyl ether has a low friction coefficient, the best wear resistance, the highest tensile strength and elongation at break, and the best comprehensive properties of the materials reported here.

本文选取主链上带有醚键的二胺单体进行分子结构设计,采用酰氯法制备了四种聚酰胺-酰亚胺(PAI)材料。含有醚基的二胺单体可以降低摩擦系数，提高PAI材料的耐磨性能。PAI 材料的磨损机制也会因醚键而改变。使用m合成的 PAI没有醚键的-苯二胺的摩擦系数和磨耗损失最高，磨损机理主要是粘着磨损。随着二胺单体结构中醚键数量的增加，材料的摩擦系数从0.5445降低到0.4216（22.57%）。使用4,4'-二氨基二苯醚合成的PAI材料的磨损量最小，比m低84.4%-苯二胺。磨损机理为磨粒磨损和轻微粘着磨损。随着醚键数目的增加，PAI的耐热性略有下降，而疏水性增加，吸水率下降。总之，使用4,4'-二氨基二苯醚合成的PAI材料具有低摩擦系数、最佳耐磨性、最高拉伸强度和断裂伸长率以及本文报道材料的最佳综合性能。