Self-organized films of supramolecular coordination polymers and their materials transport properties

以配体为取代基的金属离子和聚合物的配位逐层吸附（多配体）将用于构建配位聚合物网络的超薄膜和分离膜，并研究其材料的输运性质。目前对配位聚合物作为分离膜的研究还很少。工作的起点将是用配体作为取代基合成合适的聚合物（聚配体），该制备将以乙烯基和丙烯酸单体的自由基共聚方式进行，其中一个共聚物(A)含有配基。其他共聚单体(B)将发生变化，从而形成具有不同亲水性、电荷和pH、温度或电位敏感行为的共聚物。研究沉积薄膜的结构特性（光吸收、薄膜厚度、形貌、金属含量）。该膜将通过在多孔基底上逐层吸附各种共聚物和金属盐来制备。通过改变共聚物的单体比A:B，可以改变膜的网状密度。在扩散透析和纳滤条件下，通过测量盐和中性分子在水溶液和有机溶液中的渗透速率来研究材料的传输。不同网络密度的膜将被研究。含有阳离子或阴离子共聚单体的聚合物的膜应该能够充当阳离子或阴离子交换剂。这将通过电渗析条件下电解水溶液的脱盐和脱酸的例子来证明。制备可切换膜的可能性也将被研究。为此目的，将研究含有氧化还原活性组分或pH和温度敏感序列的共聚物的膜。对于这些膜，将试图通过改变氧化状态、pH值或温度来影响它们的通量和选择性。

Coordinative layer-by-layer adsorption of metal ions and polymers with ligands as substituents (polytopic ligands) will be used to build up ultrathin films and separation membranes of coordination polymer networks and to study their materials transport properties. Up to now there is little knowledge about the use of coordination polymers as separation membranes. Starting point of the work will be the synthesis of suitable polymers with ligands as substituents (polytopic ligands) The preparation will be carried out as radical copolymerization of vinyl- and acrylic monomers, one of the comonomers (A) containing a ligand group. The other comonomer (B) will be varied such that copolymers with different hydrophilic properties, charge, and pH-, temperature- or potential-sensitive behaviour are formed.The deposited films will be investigated on their structural properties (optical absorption, film thickness, morphology, metal content). The membranes will be prepared upon layer-by-layer adsorption of various copolymers and metal salts on porous substrates. The network density of the membranes is varied by changing the comonomer ratio A:B of the copolymer. The materials transport will be investigated by measuring the permeation rates of salts and neutral molecules in aqueous and organic solution under conditions of diffusion dialysis and nanofiltration. Membranes of different network density will be studied. Membranes containing polymers with cationic or anionic comonomer units should be able to act as cation or anion exchangers. This will be proven studying the example of desalination and deacidification of aqueous electrolyte solutions under electrodialysis conditions. The possibility to prepare switchable membranes will also be studied. For this purpose membranes containing copolymers with redox-active components or pH- and temperature-sensitive sequences will be studied. For these membranes it will be tried to influence their flux and selectivity by changing the state of oxidation, the pH or the temperature.