In-situ Polymerization Of Doped Polyaniline And Application In Micro-pattern Machining Field

In order to solve the machining problem and increase its conductivity, doped conducting Polyaniline was prepared by electrochemistry method, abio-acid doped method and emulsion polymerization doped with organic acid. The effects of the different preparation technics and technical parameters on the performance of Polyaniline were investigated. Then, blending Polyaniline-TiO₂ coat was prepared by the sol-gel method. Such coat had great practical value because it not only is water-proof but also has high conductivity. Moreover a new machining device was designed and fabricated to deposit the micro-pattern Polyaniline thin film onto concavo-convex surface. In this way the machining properties of two-dimensional pattern of conducting Polyaniline can be greatly improved.In electrochemistry, constant voltage and circle voltage-current methods were adopted. The influences of monomer concentration, protonic acid concentration, the kinds of anions and scanning speed on the properties of conducting Polyaniline were investigated. It was found that not only the polymerization speed, but also the conductivity and structure of Polyaniline can all be adjusted by choice of proper technical parameters.In bicomponent solvent system of organic solvent/H2O, Polyaniline was doped by abio-acid. It is found that the molecular weight of polyaniline is the main factor to affect its dissolution. Polyaniline with high conductivity and high product yield was obtained by polymerized at low temperature for 5h when aniline/APS is 2:1. In addition, the order of polyaniline chains can be improved by further doped with giant molecule organic acid, hence the conductivity of Polyaniline was also increased. Middle products were proved to be high-oxidation Polyaniline by on-line observation of Polyaniline-polymerization process. Theory about Polyaniline-polymerization was discussed systemically.Conducting Polyaniline that can be fully soluble in chloroform was prepared by emulsion polymerization and extraction method, doping with different dopants of macro-molecule functional protonic acids. Effects of DBSA content, which acted as dopants and emulsification APS, reacting temperature, solicitation concentration were studied. Optimization techniques is determined to be reacted at 15℃whenDBSA/aniline is about 0.83 and concentration of APS is 0.055mol/l simultaneity.In order to improve the water-proof performance and inorganic-organic interface action, a new hybrids coat with water-proof performance and high conductivity was prepared by confined Polyaniline chains into the inorganic media of TiO₂ by sol-gel methods. In such Polyaniline-TiO₂ hybrids material, conducting Polyaniline content should be about 30%wt～80%wt. The character of such polyaniline membrane material can be improved by a little GOTMS addition and dense hybrids material with net structure can be obtained by aging slowly at lower temperature.A new cheap, simple deposition technique that may be widely used was put forward on basis of the line-pattern and electrochemistry deposition principle of conducting polymer. Then Polyaniline can be applied in precision machining of two-dimensional patterns by a homemade micro-machining device. Such micro-machining device successfully prepared Polyaniline micro-patterns of variety shape, which can be uniformly distributed on stainless steel substrates. In addition, Polyaniline has also been deposited on roughened PCB board directly for the electro-deposition of Cu, through which the cost of Cu coats in PCB technique can be greatly reduced.