Porous polymeric membranes are widely used in potable water purification, wastewater treatment, the food and the pharmaceutical industries, and haemodialysis. However, producing specialized membranes with diverse transport properties is challenging. A method for fabricating membranes with controllable transport properties is described here by stepwise synthesis of aromatic oligoamide on a porous polymeric support. The use of aromatic oligoamide affords good water permeance due to its hydrophilic character. Alternate couplings of trimesoyl chloride and meta-phenylenediamine yielded an oligoamide dendrimer that was covalently bonded to the support. The water permeance and molecular weight cutoff (MWCO) of the synthesized membranes were controlled (with values of 4.6 to 543 L·m⁻²·h⁻¹·bar⁻¹ and 22.6 to 332 kDa, respectively) by adjusting the number of oligoamide synthesis cycles in the range of 2.5–20.5. The oligoamide membrane with 5.5 synthetic cycles showed a high rejection of the negatively charged rose bengal dye (95% rejection) with high flux (126.4 ± 4.2 L·m⁻²·h⁻¹ at 5.2 bar), as compared with other membranes reported in the literature. The fabricated membranes are potentially highly useful for the separation of macromolecules with specific ranges of molecular weight, for industrial separations that require membranes with tunable MWCO ranges, or for the separation of charged macromolecules.

多孔聚合物膜广泛用于饮用水净化，废水处理，食品和制药行业以及血液透析。然而，生产具有多种运输特性的专用膜是具有挑战性的。本文描述了通过在多孔聚合物载体上逐步合成芳族低酰胺来制造具有可控传输性能的膜的方法。芳香族低酰胺的使用由于其亲水特性而提供了良好的透水性。偏苯三酰氯和间苯二胺的交替偶联产生了寡酰胺树状聚合物，其与载体共价键合。控制了合成膜的透水率和分子量截留值（MWCO）（值为4.6至543 L·m ^-2 ·h^-1 ·巴^-1和22.6至332 kDa的，分别地）通过调节在2.5-20.5的范围内的低聚酰胺的合成循环的数目。与其他报道的膜相比，具有5.5个合成循环的低聚酰胺膜对负电荷的玫瑰红染料的排斥率高（95％排斥），通量高（在5.2 bar下为126.4±4.2 L·m ^-2 ·h ^-1）。在文学中。所制备的膜对于分离具有特定分子量范围的大分子，用于需要具有可调MWCO范围的膜的工业分离，或用于分离带电大分子，可能具有很高的用途。