Abstract
To improve the performance of the currently available solvent-resistant nanofiltration (SRNF) membranes, a new, unique approach was developed. In this approach, the concept of polymer of intrinsic microporosity (PIMs) is combined with the fabrication of thin film composite (TFC) membranes by interfacial polymerization (IFP) ànd the possibility to tune the molecular structure of the monomers at wish. This allows to obtain a thin active layer with a high free volume and good permeance for solvents while realizing a high solute retention. The influence of the dihedral angle of the binaphthalene-based di(acid chloride) and the influence of the number and position of the amine functionalities of the amine monomer on the membrane performance is studied. By combining a binaphthalene-based di(acid chloride) with various amine monomers containing 2.5–4 amine functions via IFP on a crosslinked polyimide (XL-PI, Matrimid) support, the permeance of acetonitrile (ACN) could be increased by a factor of 20 in comparison to standard TFC-membranes consisting of trimesoyl chloride (TMC) and m-phenylene diamine (MPD), at a 99 % retention of Rose Bengal (RB, 1017 g/mol). The highest permeance in combination with the best retention were obtained when using the methyl-linked binaphthalene di(acid chloride), which has the smallest dihedral angle.
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