为了提高聚酰亚胺的热塑性，制备兼具优异热塑性与耐热性的聚酰亚胺材料，以均苯四甲酸二酐 (PMDA) 与 3, 3', 4, 4'-联苯四羧酸二酐 (s-BPDA) 为二酐、4,4'-二氨基二苯醚 (ODA) 与 2,2'-二［4-(4-氨基苯氧基)苯基］丙烷 (BAPP) 为二胺，通过两步法成功制备了一系列四元共聚热塑性聚酰亚胺，并研究了刚性联苯基团与柔性单体、侧甲基的协同作用对聚酰亚胺材料性能的影响。利用 FTIＲ、XRD、DMA 和 TGA 等测试手段对材料的分子结构、热塑性和耐热性等进行了表征。结果表明: 该系列四元共聚聚酰亚胺具有良好的热塑性与耐热性，其中当二酐与二胺的摩尔分数比 (PMDA ∶s-BPDA∶ ODA ∶ BAPP) 为 70 ∶ 30 ∶ 70 ∶ 30 时，该材料表现出优异的热塑性和耐热性，同时在非质子极性溶剂中表现出较好的溶解性，极大地提高了聚酰亚胺在溶剂或熔融状态下的加工性能。

In order to improve the thermoplasticity of polyimide，a series of novel quaternary copolymerized poly-imide materials were successfully synthesized by two-step method with 1，2，4，5-benzenetetracarboxylic anhydride(PMDA) and 3，3'，4，4'-biphenyltetracarboxylic dianhydride ( s-BPDA) as dianhydride，4，4'-oxydianiline(ODA) and 2，2-bis［4-(4-aminophenoxy)phenyl］propane (BAPP) as diamine． The synergistic effect of rigid bi-phenyl groups with flexible monomers and pendant methyl groups on the properties of polyimide was studied． The molecular structure，thermoplasticity and heat resistance of the polyimides were characterized by FTIＲ，XRD，DMA，TGA and other testing methods． The results show that the series of quaternary copolymerized polyimides have good thermoplasticity and heat resistance． Particularly，when the molar fraction ratio of PMDA ∶ s-BPDA ∶ ODA ∶BAPP is 70 ∶ 30 ∶ 70 ∶ 30，the polyimide exhibits excellent thermoplasticity and heat resistance． What’s more，its good solubility in aprotic polar solvent can greatly improve the processing properties of the polyimide in a solvent or molten state．