Study On The Preparation,characterization And Relevant Properties Of Carbon Microcoils Grafted PANI Or DMIT

Due to their unique three-dimensional helical structure, carbon microcoils( CMCs) have excellent performances in terms of mechanics, electricity, magnetism and so on, and are a new type of carbon fiber, They have more wide application such as micro-magnetic sensors, super-capacitors, reinforcing materials and hydrogen storage materials. Polyaniline(PANI) as a kind of conjugated polymer, which has high conductive ability and can be synthesised briefly, shows potential possibility of solution and melting processiong. A series of metal-organic complexes, 4,5-dithiolato-1,3-dithiole-2-thione(abbreviated as DMIT), present excellent nonlinear optical properties and have potential applications in many fields. In this thesis, we studied the methods of adhering PANI and grafting DMIT on the surface of CMCs and the relevant properties about these two kinds of composites. The main conclusions are summarized as follows:1. CMCs/PANI composites were successfully prepared by emulsion polymerization and in-situ polymerization. The SEM images reveal that the CMCs maintain helical struction and have obvious stack of PANI on their surface; FTIR further confirms the existence of PANI. The macromolecular chain of PANI grouped on CMC surface by emulsion polymerization exists reduced state and oxidation state, while it mainly shows oxidation state by in-situ polymerization.2. The CMCs/PANI composite electrodes were synthesized by two methods of soaking and dabbing. Their CV and GCD are carried out respectively. The CV curves present redox peaks, which obviously deviate from the rectangle shape of the typical double-layer capacitance of CMCs. GCD also shows the nonlinear curve shape and the biggest capacitance of the composite electrodes can be calculated from the GCD as 134.8F·g-1 at current density 0.5 A·g-1, which is much greater than the monomer PANI value of 60F·g-1. Some factors, such as the grafting and the acid treatment to CMCs, are explored to improve the composite electrochemical performance.3. CMC grafting dmit is studied. By introducing hydroxyl groups on the DMIT, it can be implemented to synthesize the composite of H-CMCs and dmit. The Characterization of the hydroxyl groups in DMIT is characterized by 1HNMR, FTIR and UV-vis. The FTIR spectrum reveals that the H-CMCs/DMIT-OH exist ester base, which shows that the main combination of the composite is esterification synthesis.