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

超分子配位聚合物自组织薄膜及其材料传输性能

• 批准号: 225206504
• 负责人: Professor Dr. Bernd Tieke
• 金额: --
• 依托单位: Institut für Physikalische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/225206504?language=en
• 关键词: Self; organized; films; supramolecular; coordination

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.

金属离子与具有配体取代基的聚合物（多面体配体）的配位逐层吸附将用于构筑配位聚合物网络的吸附膜和分离膜，并研究其物质传输性能。配位聚合物作为分离膜的应用目前还知之甚少。工作的起点将是合成具有配体作为取代基的合适的聚合物（多面体配体）。制备将作为乙烯基和丙烯酸单体的自由基共聚进行，其中一种共聚单体（A）含有配体基团。另一种共聚单体（B）可以变化，从而形成具有不同亲水性、电荷和pH、温度或电位敏感性的共聚物。该膜将在各种共聚物和金属盐在多孔基底上逐层吸附后制备。通过改变共聚物的共聚单体比率A：B来改变膜的网络密度。在扩散渗析和纳滤条件下，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物质的传输。将研究不同网络密度的膜。含有具有阳离子或阴离子共聚单体单元的聚合物的膜应该能够充当阳离子或阴离子交换剂。这将通过研究电解质水溶液在电渗析条件下的脱盐和脱酸的实例来证明。还将研究制备可切换膜的可能性。为此，将研究含有具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或温度来影响它们的通量和选择性。