The application of ionic liquids in the enzymatic polymerization of aniline

• Main Authors: Tsai Ju-Ya, 蔡茹雅
• Other Authors: 顧野松
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/21544386903726515707

碩士 === 東海大學 === 化學工程與材料工程學系 === 98 === Polyaniline (PANI) is one of the most interesting conducting polymers due to its good stability and excellent electrical and optical properties, in which have potential technological applications in chemical synthesis, electrochemisty, extraction, and others. In recent years, the use of enzymes as biological catalysts for the synthesis of polyaniline has attracted great attentions. Enzymatic synthesis can offer an environmental friendly condition that is more acceptable than that of chemical synthesis. Recently, the biocatalytic approach has been developed to synthesize water-soluble conducting polyaniline at a pH around 4.0. Sodium dodecylbenzenesulfonate (SDBS) is normally used as a doping agent for aniline polymerization. The enzymatic synthesized polyaniline is electrically active and soluble in an aqueous solution. In this study, we have further confirmed that SDBS was a suitable template for the enzymatic synthesis of conducting polyaniline, but it caused the inactivation of HRP, an enzyme used for polyaniline synthesis. In order to overcome this problem, ionic liquids (IL) was selected to maintain and improve HRP activity. Ionic liquids (IL) is an organic salt with a low melting point that is being the focus of many investigators because of their good chemical stability, low flammability, negligible vapor pressure and reusability. In this study, we have found that [bmim]OTf, an hydrophilic IL, did not have a deteriorate effect on the activity of HRP, but made it possible to recovery active HRP after polymerization. In addition, the synthesized polyaniline exhibited expected thermal and electrochemical properties.