Preparation And Characterization Of Polyaniline Colloidal Dispersions And Polyaniline-Polymer Composites

Polyaniline (PAn), one of the oldest conductive polymer, is under extensive study even today because of its high environmental stability, low cost, and simple synthesizing procedures. The main disadvantage of conductive PAn, like others conductive polymers, is its intractable nature, especially in the doped form. This assignment is about to improve poor processing of PAn and prepare functional conductive material.In the first section of the dissertation, we introduce some research progresses about conductive polymer, polyaniline and some ways of improving poor processing of polyaniline.In the second section, we use dispersion polymerization to prepare a series of polyaniline-poly(N-vinylpyrrolidone)(PVP) colloidal dispersions of high PAn content, PVP is water-soluble steric stabilizers. (In this experiment, the highest aniline content is 67% when the system of PAn-PVP colloidal dispersions is steady). The structure and morphology of PAn-PVP composites are investigated by TEM, FTIR, UV-Vis and TG. It is found that product is PAn-PVP composite, this composite's thermal degradation temperature is lower than PAn's, and the appearance of colloidal PAn-PVP microparticles is spheres or "rice-grains". In addition, we also study the influence of temperature and kinetics of aniline dispersion polymerization. We find 0°C is appropriate temperature of aniline's dispersion polymerization, and the final conversion of aniline is 106.5% because the product is PAn-PVP composite. At last, it is found we can prepared PAn-PVP composite films easily by using PAn-PVP...