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Preparation and Properties of Polypyrrole with Micro/nanostructures

Author: MaHuiRong
Tutor: LiMei
School: Shandong Institute of Light Industry
Course: Polymer Chemistry and Physics
Keywords: Polypyrrole Soft template Nanowires Orderly Conductive
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 149
Quote: 1
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Abstract


Polypyrrole micro-nano material has excellent physical and chemical properties, electronic devices have the potential broad application prospects. To improve the conductivity of the polymer is one of the important purpose of studying conductive polymer, but recent studies indicate that closely related to the morphology of polypyrrole and its conductivity, so to control the size, dimensions and orientation of the polypyrrole, the pyrrole molecule to be assembled in accordance with a specific rule, composite, and has a very important practical significance for improving its electrical properties. In this thesis, the various templates for the morphology of inducing agent, the use of the chemical oxidation method to prepare a polypyrrole nanowires orderly, the wire harness, the particles and the material of special morphology, and its preparation conditions and preparation principle discussed in detail . Through experiments, the present study was prepared by the anionic surfactant sodium dodecyl sulfate as the dopant polypyrrole, the polypyrrole obtained a variety of micro / nano-topography, the morphology of polypyrrole and polypyrrole. The relationship between the conductivity, and study the impact of experimental conditions on the of polypyrrole morphology and electrical properties. Obtained through experiments, the prepared polypyrrole nanowires and harness the best solution, controlling the concentration of the sodium lauryl sulfate solution of 0.75mol / L constant, the pyrrole monomer added in an amount of 0.03mol / L can be obtained when the nano line structure polypyrrole, pyrrole monomer added in an amount increased to 0.075mol / L can be obtained when the nano cluster structure polypyrrole, and the degree of ordering and the conductive polypyrrole harness rate reaches the optimum value. Changing the kind of the surface active agent, and as dopant to the p-toluene sulfonate to give the nano-polypyrrole particles. In this paper, a dilute solution of natural macromolecules gelatin as template to synthesize a conductive polypyrrole, and found that gelatin in the synthesis process of polypyrrole play the role of the soft template. Gelatin solution controlled at a very dilute concentration range, the gelatin molecules in the presence of water may be provided to the single molecule crimped state, pyrrole monomer is polymerized in a very small space within a single curl molecules synthesized polypyrrole particle sizes can be up to tens of nanometers, within. And may also be prepared polypyrrole materials partially ordered, but the formation of a special related to the morphology and the added amount of the dopant and pyrrole monomer. Finally, referring to the literature the polypyrrole prepared on the surface of the organic single crystal having a similar crystal structure, potassium nitrate crystals were prepared at a low temperature first and then on its surface polymerization of pyrrole monomer, to thereby obtain very interesting valley-like structure polypyrrole material, and its electrical conductivity four orders of magnitude compared to the polypyrrole particles improve.

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