Structural Effects of Ion Transport in Macromolecules

点击翻译按钮获取中文摘要

It is a fundamental, but a most powerful methodology for developing new materials to utilize characteristic molecular assembly of substances. This research has been aimed at exploring structural effects of ion transport in macromolecules, especially in physically or chemically crosslinked polymers above their glass transition temperatures, which are unique and dynamic molecular assembly of macromolecules. The important results of this research are as follows:1. Development of Methodology for Characterizing Ion-Conducting Polymers Ionic transport number and potential window of ion-conducting polymers have been successfully allowed to be estimated by the combination of complex impedance and potentiostatic polarization methods and by the utilization of solid-state-three-electrode-cells having ultra-microelectrodes, respectively.2. Structural and Dynamic Effects of Ion Transport in Macromolecules It has been demonstrated that the most characteristic behavior of ion transport in macromolecu … More les is the carrier generation caused by cooperative solvation of neighboring polar groups in polymer chains to ions (intramolecular solvation) and the completely coupled ionic transport with segmental motion of the polymer chains that are responsible to the solvation. These important results were deviated by using several model polymers based on polyether networks and polyglutamates. Li^+ conducting polymers having its transport number of unity have been gynthesized by introducing -SO^-_Li^+ groups into polyether urethanes.3. Function of Ion-Conducting Polymers as Reaction Media Ion-conducting polymers have interesting property to incorporate redox active molecules by simple dissolution or chemical modification, in addition to ion-conducting property. Combination of these two properties has led to an idea that ion-conducting polymers can be used as solid state solvents for electrochemidal syntheses and electrochemical reactions. In order to demonstrate this idea, electropolymerization of pyrrole has been carried out, resulting in redox active bilayers consisting of electron/ion conductors. It is also found that ferrocene dissolved in ion-conducting polymers undergoes a reversible redox reaction in the absence, of any low-molecular-weight solvent. Less