具有良好pH依赖性和电化学可控性的导电共聚物离子色谱固定相

项目名称： 具有良好pH依赖性和电化学可控性的导电共聚物离子色谱固定相

项目编号： No.21275023

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 孔泳

作者单位： 常州大学

项目金额： 80万元

中文摘要： 采用化学氧化法制备苯胺与带有羟基的芳香族化合物的共聚物。由于这类共聚物链上的酚羟基可发生可逆的氧化还原（酚-醌-酚），并且在氧化还原过程中伴随着质子的交换，因而该共聚物克服了聚苯胺的局限性，适用于较宽的pH范围；另外，由于该共聚物是一类有机半导体，因此还具有良好的导电能力。同时，导电共聚物还具有脱掺杂/掺杂且两者完全可逆的特性：当共聚物呈还原态时，内部掺杂的阴离子发生脱掺杂；呈氧化态时，又可将流动相中的阴离子掺杂到共聚物骨架中。而导电共聚物这种还原/氧化态之间的转变可通过改变电位而实现，这意味着可通过电化学调控来实现离子的交换。导电共聚物的这种离子交换特性使它成为一类优良的离子交换材料，如将其作为新型的离子色谱固定相，该固定相将同时具备良好的导电能力和离子交换能力，且可以适用于广泛的流动相酸度范围。只要对该导电共聚物固定相加以简单的电化学调控，就可实现阴离子在该导电固定相上的分离。

中文关键词： pH依赖性；电化学可控；导电共聚物；离子色谱；固定相

英文摘要： Copolymers are synthesized via the chemical copolymerization of aniline and aromatic compounds with hydroxy group.Phenol can be oxidized to quinone, and quinone can be reduced to phenol. This redox is reversible and must be accompanied with proton exchange; hence, the redox of phenol units in the copolymer chain plays a key role in extending the usable pH range of the copolymer compared with conventional polyanline, which usable pH region is limited to below pH 4.0.Since the copolymer is a kind of organic semiconductor, it has a satisfactory conduct electricity.In addition, conducting copolymer has the unique property of reversible de-doping/doping.When a cathodic potential is applied on the conducting copolymer, the polymer returns to its reduced state with negative charge, causing the doped anions to be released (i.e.de-doping).When an anodic potential is applied,it carries positive charge.The oxidation of the copolymer is accompanied with incorporation of anions from the mobile phase into the polymer,i.e.doping,to maintain its electric neutrality.The convertion between reduction and oxidation state of the copolymer can be simply achieved by potential switch, which indicates that the exchange of different ions on the copolymer stationary phase can be controlled by electrochemistry.The property of ion exchange

英文关键词： pH dependence；electrochemical controllable；conducting copolymer；ion chromatography；stationary phase