Abstract Composite membranes are the work horse of reverse osmosis and nanofiltration processes. Recently, we presented a chemistry in a spinneret methodology. The membrane forming polymer reacts with a monomer/cross-linker added to the bore fluid resulting into a composite membrane made by a single process step. Here, the reaction of a cross-linking agent and an amine reactant superimposes the conventional phase inversion of an inert polymer during dry-jet wet spinning. While the inert polymer precipitates as porous support structure, the cross-linking reaction forms the desired dense separation layer on the lumen-side. Such membranes have nanofiltration properties and can be backwashed extensively. Two different interfacial condensation reactions showcase the versatility of this method and the used polyethyleneimine determines the salt retention hierarchy given by its positive charge. This work suggests that the many established membrane postmodifications known in the field could be considered for this “chemistry in a spinneret” inline modification.

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喷丝头中的化学——一步法中的复合中空纤维膜

摘要 复合膜是反渗透和纳滤过程的主力军。最近，我们提出了一种采用喷丝板方法的化学方法。成膜聚合物与添加到钻孔流体中的单体/交联剂反应，形成通过单一工艺步骤制成的复合膜。在这里，交联剂和胺反应物的反应叠加了干喷湿纺过程中惰性聚合物的常规相转化。当惰性聚合物作为多孔载体结构沉淀时，交联反应在腔侧形成所需的致密分离层。这种膜具有纳滤特性，可以广泛地反冲洗。两种不同的界面缩合反应展示了该方法的多功能性，所使用的聚乙烯亚胺决定了由其正电荷给出的盐保留等级。这项工作表明，该领域已知的许多已建立的膜后修饰可以考虑用于这种“喷丝头中的化学”在线修饰。