中文摘要：

采用热致相分离法,以己内酰胺为溶剂,制备得到了聚苯硫醚微孔膜并对薄膜性能表征.聚苯硫醚-己内酰胺体系制膜的优点之一是溶剂己内酰胺是水溶性的,可以采用纯水作为后处理的萃取剂.选择了合适的浓度,利用压制成型法制备聚苯硫醚平板膜;研究了体系冷却时的相行为,并考察了降温速率、聚合物浓度等因素对微孔形态与薄膜性能的影响.研究表明,聚苯硫醚-己内酰胺体系以固液分相为主,萃取后形成球晶状的微孔结构.降温速率对薄膜的微孔形态、孔径以及连通性有重要影响;当体系以较低降温速率冷却时,多孔形态为枝叶状,形成了更多的开孔结构并获得了更大的孔径,这是获得高通量微孔膜的主要原因.通过控制降温速率可以制备纯水通量大于100 L/m2h,孔径约4～5μm且连通性良好的聚苯硫醚微孔膜;研究了聚合物浓度的影响,薄膜的纯水通量随着聚合物浓度的增大而减小,并且当聚苯硫醚浓度〉50 wt%时,由于大于临界浓度而失去渗透性.

英文摘要：

A water-soluble solvent,i, e. ,epsilon-caprolactam （CPL） ,was used as the diluent and microporous poly（phenylene sulfide） （PPS） membranes were prepared through the thermally induced phase separation method. One of the greatest advantages of using CPL is that the solvent is soluble to water and is able to be extracted by water,which is very clean and friendly to environment. By selecting a suitable composition, the pour-pressing process was used to make PPS fiat membranes for performance and morphology characterization. The phase behavior of PPS/CPL blend was first depicted to identify the phase separation process of this binary system. The effects of cooling rate and polymer concentration on the morphologies and performances of PPS membranes were then investigated. The studies showed this binary system underwent solid-liquid phase separation via nucleation and growth of polymer crystals and then produced a structure described as ＂polymer spherulite-like＂. The process upon slow cooling permits the system to develop into a leafy structure with more open pores and larger pore size than the rapid cooling process, which endows the membranes with a large permeation water flux. It was indicated through experiments that there was an operative window to prepare a poly（phenylene sulfide） membrane with pure water flux greater than 100 L/m~h and pore size about 4 -5 }xm. The effect of polymer concentration was also studied and it was found that the permeability of microporous membranes decreased as the concentration of PPS increased. The membranes without any permeability were prepared when the polymer concentration was greater than 50 wt% due to too low porosity of the membranes.