Synthesis of Molecular Level Ordered Polymer Nano Composites Based on Two-monomer-connected Precursor (TMCPs) for Energy Storage System

Abstract

Molecular level ordered functional polymers (conducting polymers, redox polymers) and polymer nanocomposites are prepared and analyze these inherent properties and crystal structure. The electrical and electrochemical properties of these materials which have improved properties are analyzed for a lot of practical applications in various fields. Chapter 1 covers key concepts including recent advances in functional polymers (conducting polymers, redox polymers), improved methods of process engineering to produce polymer with high crystallinity, molecular level ordered polymers, material properties for electronic and electrochemical applications. Chapter 2 introduces a polymer nanocomposite, P(Py:BPDSA:Py)-MoS2, with improved properties by synthesizing a crystalline polymer on a 2D nano sheets in a simple method by a two-monomers-connected precursor (TMCP), in which two monomers are linked by ionic bonding. As an energy storage material, molybdenum disulfide (MoS2), a fascinating transition metal compound with redox properties, is used as a 2D nano sheet to enhance the electrochemical properties. The crystal structure of this composite is analyzed by X-ray diffraction (XRD) and high-voltage electron microscopy (HVEM), which shows a face-centered cubic (FCC) crystal structure which is a dense crystal structure appearing in the metal series. In addition, it exhibited a larger specific surface area than pure polymers, and these properties showed applicability as an energy storage material. By analyzing various properties of this composite, it was confirmed that the merits of the polymers with high crystallinity and the 2D nano materials having a large specific surface area were synergistic. In addition, polymer nanocomposites having these characteristics are applied for electrochemical storage system. Chapter 3 introduces anthraquinone, one of a fascinating redox material in energy devices, to the preparation of novel composite. The sub-nanometer level ordered polymer, P(Py:AqDSA:Py), on MoS2 from TMCPs which was synthesized using anthraquinone as an linker between two monomers, is synthesized. Anthraquinone has excellent properties as a redox material, but has low electrical properties because it is an insulating material. However, polymers with high crystallinity obtained by using anthraquinone in TMCPs and controlling nanoscale molecular level arrangement have not only electrochemical properties but also increased electrical properties. The nano-composite based on anthraquinone, which has a unique crystal structure and complementary electrical properties, has high energy density as well as high power density, and is expected to be applied to more diverse electric and energy fields as a next-generation energy storage material. Chapter 4 discusses a highly crystalline polymer which is synthesized in magnetism field using the magnetic properties of ferrocene to synthesize polymer with molecular level arrangement and high crystallinity. The sub-nanometer level ordered polymer, P(Py:FDSA:Py), from TMCPs which was synthesized TMCP using ferrocene was as an linker between the two monomers, is synthesized and it was confirmed that TMCPs are molecular level arranged in the magnetic field. The crystallinity of the polymer increased by polymerization between the molecular level ordered TMCPs. The crystal structure of this composite is analyzed by X-ray diffraction (XRD) and high-voltage electron microscopy (HVEM). A functional polymer having improved properties by controlling the molecular level ordering can be expected to be applied to various electronic and energy devices.