Polynaphthalimide (PNI) with six-membered imide ring (₆-PI) has better chemical resistance than five-membered imide ring (₅-PI), but is difficult to be processed into nanofibers due to the poor processability. In this work, we proposed a template strategy to fabricate nanofiber ₆-PI membranes and their composite membranes. Neat ₆-PI and ₆-PI composite fibrous membranes were prepared using high-molecular-weight polymers ₅-PAA and PVP as templates by electrospinning. FTIR, DMA, TGA and tensile tests were used to characterize their chemical structures, thermal stability and mechanical properties. Further eye-observation, micro-morphology investigation and tensile tests were applied to evaluate the chemical resistance of nanofibrous membranes in strong acid, strong alkaline, and concentrated salt. The results demonstrated that ₆-PI nanofibrous membranes possessed the best thermal stability, best acid, alkaline, and salt resistance with the highest mechanical retention. This study will provide basic information for high-performance electrospun ₆-PI nanofiber membranes and provide opportunities for applications of PIs in different chemically harsh environments.

具有六元酰亚胺环（_6- PI）的聚萘二甲酰亚胺（PNI）比五元酰亚胺环（₅ -PI）具有更好的耐化学性，但由于加工性差，难以加工成纳米纤维。在这项工作中，我们提出了一种模板策略来制造纳米纤维_6- PI 膜及其复合膜。使用高分子量聚合物制备纯₆ -PI 和₆ -PI 复合纤维膜₅-PAA 和 PVP 作为模板通过静电纺丝。FTIR、DMA、TGA和拉伸测试用于表征它们的化学结构、热稳定性和机械性能。进一步的目视观察、微观形态研究和拉伸试验被用来评估纳米纤维膜在强酸、强碱和浓盐中的耐化学性。结果表明，_6- PI纳米纤维膜具有最佳的热稳定性、最佳的耐酸、耐碱和耐盐性，并具有最高的机械截留率。该研究将为高性能电纺₆ - PI 纳米纤维膜提供基础信息，并为 PI 在不同化学恶劣环境中的应用提供机会。