Synthesis And Characterization And Applications Of Functionalized Electromagnetic Polyaniline Composites

Functionalized conducting polymer composites are the structural and compound materials prepared by the complexation of conducting polymer with some functionalized materials, which can be used in microwave absorbing, membrance separation, organic catalysis and so on. For example, Polyaniline, for its easy preparation, good and controllable electrical conductivity, is one kind of the dielectric loss material and can be designed for microwave absorbing material. The novel microwave absorbing material must have the characteristics of 'thin, light, wide and strong'. For this reason, novel Polyaniline composites have become one of the most extensively studied microwave absorbing materials these years.In this paper, we synthesized the functionalized electromagnetic Polyaniline composites, which have good electrical conductivity, mass susceptivity, and dielectric and magnetic loss. The products were characterized by FT-IR, in-situ UV-Vis, TGA, SEM and other techniques. Furthermore the electrical conductivity, mass susceptivity and microwave absorption parameter were measured. The main research contents were as follows:(1) The Polyaniline doped with ferrocenesulfonic acid was synthesized via solid-state ball-milling, and characterized by FT-IR and UV-Vis spectroscopy, SEM and other techniques. Furthermore the electrical conductivity and mass susceptivity were measured. It solved the problem that acidity of ferrocenesulfonic acid is too weak to dope Polyaniline. And the 'synergetic effect' between FeSO₄·7H₂O and ferrocenesulfonic acid during the doping process of Polyaniline was studied in detail. The results show that the target products exhibit both good electrical conductivity and mass susceptivity.(2) The Polyaniline doped with FeSO₄·7H₂O was prepared by solid-state ball-milling and emulsion method, respectively. The products were characterized by FT-IR, UV-Vis, TGA, SEM, XRD and so on. And the electrical conductivity, mass susceptivity and electromagnetic parameters were measured. The results demonstrated that the stronger complexation/doping interaction existed between Polyaniline molecule chains and Fe²⁺ ions.(3) Fe₃O₄/poly (styrene-co-sodium styrene sulfonate) and Fe₃O₄/poly (styrene-co-sodium styrene sulfonate)/polyaniline were synthesized and characterized by FT-IR, VSM, TGA, SEM, XRD and other techniques. The resulting composites were found to have certain electromagnetic absorbing ability and good processing ability. The filming ability of Fe₃O₄/PS-co-sPS/PAn composites was studied preliminarily, which may offer a feasible way for the processing of Polyaniline composites.(4) Hollow PAn/Fe₃O₄ microsphere composites with electromagnetic function have been successfully synthesized via decorating Fe₃O₄ magnetic nanoparticles on the surface of hollow polyaniline/sulfonated polystyrene microspheres. The products were characterized by FT-IR, UV-Vis, VSM, TGA, SEM, XRD, and other techniques. The corresponding electromagnetic parameters were obtained. The results indicated that the Fe₃O₄ nanoparticles existed in the resulting product and the composites have excellent reflection loss when wrapped proper amount of magnetic fluid Fe₃O₄. It provided theoretical basis for the application of the products as microwave absorbing materials.