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Preparation and properties of polyaniline and its composites

Author: WangXing
Tutor: GuanRongFeng
School: Henan Polytechnic University
Course: Mineral Processing Engineering
Keywords: Polyaniline Composite Doping Polyvinyl alcohol Anti-corrosion
CLC: O633.21
Type: Master's thesis
Year: 2009
Downloads: 134
Quote: 2
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Abstract


Because of diversification in structure, flexible doping conducting and the low cost, Polyaniline has widespread application in such regions as metal anticorrosion, electromagnetic interference shielding, rechargeable battery, sensor, and solar cell and so on. The doped polyaniline was mostly researched in this paper. At first, the synthesization, characters, conducting mechanism, its composites and their application were introduced. Then the performance changes after doped by different acids concluding inorganic acids and organic acids. Two polyaniline composites, polyaniline/polyvinyl alcohol and polyaniline/epoxy resin were prepared.Polyaniline doped by hydrochloric acid was yield by oxidation of once distilled aniline in distilled water being ammoniumperoxydisulfate as oxidant. The result of orthogonal analysis is as follows: concentration of hydrochloric acid is 1.0 mol·L-1, ratio of oxidant to aniline monomer is 1:1 and response time is 4 hours at room temperature. The structure of polyaniline is crystal to a certain extent indicated by FT-IR spectrum, X-radial diffraction and scanning electron microscope.The polyaniline doped by dodecylbenzene sulfonic acid (DBSA), sulfosalicyclic acid (SSA), Aminobenzenesulfonic acid (ABSA) and citric acid (CA) were prepared. Polyaniline’s solubility was improved because the large-size organic acids in the chains weaken the interaction between molecules. Conductivity analysis showed the conductivity of polyaniline doped by sulfosalicyclic acid reached 1 S·cm-1. Scanning electron microscope analysis showed the size of polyaniline particles was micron level and crystal can be improved through doping by two different acids.The percolation threshold of polyaniline in polyaniline/polyvinyl alcohol composite is 25%. Scanning electron microscope analysis showed that the micro-and nano-fiber microstructure of polyaniline synthesized in solution was more congregated than the polyaniline prepared by in-suit polymerization.Polyaniline/ (epoxy resin) anti-corrosion coating was prepared with polyaniline as conductive filler and epoxy resin as film media. The analysis showed that coatings were good at anti-corrosion for homogeneous microstructure and perfect chemical resistance.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Miscellaneous Chain Polymers > Nitrogen-containing polymer chain > Polyamines
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