Abstract Hollow fiber membrane modules are backwashable, less prone to fouling and exhibit higher packing densities compared to spiral wound modules. Nevertheless, most commercial nanofiltration membranes are flat sheet membranes because the production process of composite membranes is at the moment only feasible for flat sheet membranes. In this work, we present the complex but robust fabrication of cross-linked polyelectrolyte nanofiltration hollow fiber membranes using our chemistry in a spinneret technique. We combine three processes in one fabrication step: 1. Ionic cross-linking between oppositely charged polyelectrolytes, 2. covalent cross-linking of amine groups and 3. phase inversion of an inert membrane forming polymer. The amine component as reactant is dissolved in the polymer solution, while the bore fluid contains a cross-linker and a negatively charged polyelectrolyte. Morphology, surface elementary composition and surface charge analysis prove the successful formation of the cross-linked polyelectrolyte separation layer on the lumen channel surface of the fabricated fibers. The fibers show nanofiltration properties regarding high salt retentions and a low molecular weight cut-off of 280 Da. The presented spinning technique shows a promising potential to become an attractive alternative to multi step fabrication methods.

中文翻译：

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喷丝头中的化学——形成具有交联聚电解质分离层的中空纤维膜

摘要 与螺旋缠绕组件相比，中空纤维膜组件可反洗、不易结垢并具有更高的堆积密度。然而，大多数商业纳滤膜是平板膜，因为复合膜的生产过程目前仅适用于平板膜。在这项工作中，我们展示了在喷丝板技术中使用我们的化学方法复杂但稳健地制造交联聚电解质纳滤中空纤维膜的方法。我们在一个制造步骤中结合了三个过程：1. 带相反电荷的聚电解质之间的离子交联，2. 胺基团的共价交联和 3. 惰性成膜聚合物的相转化。作为反应物的胺组分溶解在聚合物溶液中，而孔内流体包含交联剂和带负电的聚电解质。形态、表面元素组成和表面电荷分析证明在制造的纤维的腔通道表面上成功形成了交联聚电解质分离层。该纤维显示出关于高盐截留率和 280 Da 的低分子量截止值的纳滤特性。所提出的纺丝技术显示出成为多步骤制造方法的有吸引力的替代方案的有希望的潜力。该纤维显示出关于高盐截留率和 280 Da 的低分子量截止值的纳滤特性。所提出的纺丝技术显示出成为多步骤制造方法的有吸引力的替代方案的有希望的潜力。该纤维显示出关于高盐截留率和 280 Da 的低分子量截止值的纳滤特性。所提出的纺丝技术显示出成为多步骤制造方法的有吸引力的替代方案的有希望的潜力。