Synthesis Of Conducting Polymer Pedot Dispersion And Application In Antistatic Coating

Conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) has obtained extensive attention because of its high conductivity, good environmental stability and transparency film, and showed broad application prospects in the fields of antistatic coating, photoelectric diode, sensors and so on. Unfortunately, highly conjugated backbones of PEDOT which cause insoluble and non-melt problems also lead to the material being rather intractable, thus the commercial application has been limited. To improve the processing performance of PEDOT has been important and meaningful in this field of research. A direct and important mean to solve the problem is preparing PEDOT dispersions. Around to explore ways to improve the processing property of PEDOT, this article has successfully prepared two different types of PEDOT dispersions, copolymer acid doped and based on polyurethane latex particle, by chemical oxidation polymerization. And studied the affecting factors of two different dispersions stability and application in antistatic coatings.Starting from the doping agent, the article has synthesized copolymer acid doped PEDOT/PSS-VS dispersion using copolymer PSS-VS of sodium p-styrenesulfonate (SSS) and sodium vinylsulfonate (SVS) as dopant. The stability and conductivity of dispersion affected by copolymeric ratio, molecular weight and amount of PSS-VS and other factors were investigated and the optimal oxidative polymerization conditions have been found: the copolymeric molar ratio of SSS/SVS is 5/5, molar ratio of SO3-/EDOT and oxidation/EDOT are 2/1 and 1.5/1, the solid content is 2.8wt%. Preparing under the conditions, the conductivity and average particle size of PEDOT/PSS-VS are 11.74S/cm and 447nm respectively.Starting from the particle morphology, the article has prepared PEDOT/PU dispersion based on home-made polyurethane(PU) latex particle, and the properties of dispersion affected by different synthetic conditions and particle sizes of PU substrate are researched. By dynamic light scattering and four-probe test, the particle size distribution of PEDOT/PU dispersion broadens, and the average particle size and conductivity increase. Comprehensive consideration of stability and conductivity, the quality ratio of EDOT/PU in preparation process is 1/10. TEM analysis indicates that the composite particles show a core-shell structure, and the particle sizes of PU substrate have great influence on the morphology of composite particles.Antistatic coatings have been prepared using two self-made PEDOT dispersions as conductive component and applied to plastic substrates. The results of basic analysis of the coating film show that the adhesion of coating achieves 2, light transmission is more than 85%, washing performance and stability are good, the surface resistance is 108Ω, which meet the requirements of antistatic coating.