以杂萘联苯聚醚砜酮/聚乙烯吡咯烷酮/N-甲基吡咯烷酮（PPESK/PVP/NMP）为铸膜液体系，对杂萘联苯聚醚砜酮的膜结构进行了计算机直接试验设计。结果发现采用膜结构参数——趋向海绵膜结构特征分数St，可以对膜结构进行定量化表征和设计。以聚合物浓度和PVP添加剂作为影响因素，通过直接实验设计，分别得到了描述PPESK膜水通量、截留率、膜结构的3个数学模型。这3个数学模型表明，PVP添加剂和聚合物浓度能显著地影响膜的水通量、截留率和结构；随着聚合物和PVP添加剂浓度的增加，膜的水通量显著下降，截留率降低，膜结构逐渐由指状结构变为海绵结构。实验值和模型的预测值吻合得较好，表明采用直接实验可以实现对PPESK超滤膜的膜结构与性能的调控。

A random-arranged experimental design method has been used to study the structure and performance of poly(phthalazine ether sulfone ketone) (PPESK) membranes. A new parameter, fraction tending to sponge structure characteristics (St), was put forward in order to undertake a quantitative analysis of the membrane structure. Three mathematical models for pure water flux, reject performance, and membrane structure, were derived in order to determine the effect of added (poly vinylpyrrolidone) (PVP) and polymer concentration on the properties of the PPESK membrane. The results indicated that addition of PVP led to significant changes in the reject performance, pure water flux, and structure of the PPESK membrane. When the PVP concentration was increased, the pure water flux dropped markedly, and the reject performance of the PPESK membrane increased significantly, and at the same time the membrane structure changed gradually from finger-like to sponge-like. The same changes were observed with increasing PPESK concentration. The results of the mathematical models gave a very good agreement with the experimental results. 