Preparation And Property Of Electric Functional Composites Polymer/graphene/rare Earth

Conductive polymer-inorganic nanocomposites has drawed high attention in electricity, mechanics, mechanics and magnetics etc. Due to low cost, high electrical conductivity and the simple preparation technology. Conductive polymer is through the doping, and other means to make the conductivity of the polymer in the scope of semiconductor and conductor. The so-called intrinsic conducting polymer refers to the conductive polymer that the conductivity are very low without doping process, belongs to the insulator, while the conductivity of conductive polymers improved obviously after doping methods. The main chain of this kind of polymers have a alternating single bond and double bond, which formed a large conjugate π system, the flow of π electronic produced electric possibility. Since2004graphene has drawed great attention because of its unique electrical, mechanics, optics, magnetism, energy storage. Therefore, this topic is to optimize the polymer/graphene composite material for the fulcrum, synthetic the conducting materials of polypyrrole/graphene/rare earth, and rapid synthesis and further screening this kind of material and mining the application potential through improvement and optimizationnn the experimental method.This study is divided into three parts:First, Polypyrrole has good air stability, graphene has high conductivity and excellent performance, The effective combination of polypyrrolehe and graphene can get a composite materials with good electrical conductivity. This paper has first reported the synthesis of a new type of composite material. NanoGs were prepared by treating the expanded graphite with sonication in95%alcohol solution, then p-toluene sulfonic acid as surfactant, polyethylene glycol (peg)-400for dispersing agent, the Polypyrrole/NanoGs/rare earth nanocomposites were successfully prepared by in-situ polyme-rization. The structure, morphology, thermal stability and conductivity of the composites are characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), thermogravimetric analysis (TG) and four point probe. The Polypyrrole/NanoGs/rare earth nanocomposites exhibited much higher electrical conductivity and better thermal stability than the pristine Polypyrrole. Second, graphite powder as raw material, prepared graphene through the Hummer, then with p-toluene sulfonic acid as surfactant, polyethylene glycol (peg)-400for dispersing agent, we successfully prepared Polypyrrole/graphene/rare earth conductive composite materials through in situ polymerization, The morphology thermal stability and conductivity of the composites are characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), thermogravimetric analysis (TG) and four point probe. The results showed that the conductivity and stability of the composites have improved.Third, graphite powder as raw material, prepared graphene through the Hummer, then use hydrochloric acid solution doping and ammonium persulfate as the initiator, we successfully prepared polyaniline/graphene/rare earth conductive composite materials through in situ polymerization, The structure, morphology and stability of the composites are characterized by scanning electron microscope (SEM), the results showed that the polyaniline coating on the surface of graphene. Thermogravimetric analysis(TG) and four probe meter test results showed that the conductivity of composites and thermal stability have been improved obviously.