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The Preparation And Characterization Of Conducting Polymers With Electromagnetic Function

Posted on:2011-07-26Degree:MasterType:Thesis
Country:ChinaCandidate:Z J CuiFull Text:PDF
GTID:2131330332964754Subject:Applied Chemistry
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Conducting polymer micro/nano-structures have attracted great attentions of the scientists because the CPs has highly conjugated molecular structure, controllable conductivity. The nano-composite materials of inorganic nano-particles with conductive polymer have been stuided to make another multi-functional conductive polymer. Especially, electro-magnetic functionalized conductive polymers with special physical and chemical properties have been extensively studied. In this thesis, Poly (3,4-ethylenedioxythiophene) (PEDOT) micro/nano-structures were prepared by a "free-template" method and electro-magnetic functionalized micro/nanostructures of conducting polymers were synthesized successfully through a "chemical one-step" method. The combination of oxidative polymerization of pyrrole (or 3,4-ethylenedioxythiophene) and magnetic iron oxide was successfully performed to prepare the micro/nanostructures of conducting polymer/y-Fe2O3. The main results achieved are the following:1. By "chemical one-step" method, polypyrrole/y-Fe2O3 misro-nanospheres were synthesized successfully. The oxidation polymerization of pyrrole and the formation of y-Fe2O3 happened at the same time to get both high electricic and high magnetic properties of composites, which simplified the experimental procedures greatly. It is found that TsOH/Py molar ratio had an important effect on the morphology, conductivity and magnetic properties when p-toluene sulfonic acid was used to the dopant,. The uniform miscro/nanospheres with 140-250nm in average diameters were obtained. When TsOH/Py=2, the product with the maximum conductivity of 42.86S/cm. When the TsOH/Py=0.1, the maximum saturation magnetization reached 2.0 emu/g. On the other hand, micro/nanospheres with 79-90nm in diameter also can be prepared when perfluorooctanoic acid, trifluoroacetic acid, phosphoric acid and acetic acid were used as the dopants. Their conductivity was in 20~30 S/cm. Tthe electrical and magnetic properties of the composites can be changed by changing the dosage of FeCl3.6H2O and FeCl2.4H2O.2. With a "free-template" method, the effects of different oxidant on the preparation of PEDOT. It was found that FeCl3.6H2O as oxidant exhibited best. PEDOT micro/nanostructures were successfully prepared when FeCl3.6H2O was 7.58g. At the same time, the influence of different surfactants on the PEDOT micro/nanostructures also was investigated. The yield and conductivity of product prepared with CTAB, OP-10, Na-NSA as the surfactant are higher than those prepared without surfactants. Theor room-temperature conductivity is 33.8,43.5,37.8 S/cm, respectively. It is noted that the amount of CTAB have an evident effect on the average diameter of PEDOT micro/nanospheres.According to the above results, PEDOT/y-Fe2O3 composites with high electrical and magnetic properties were successfully prepared by a "chemical one-step" method with CTAB as the surfactants. The electrical conductivity and magnetization is 48.7 S/cm and 18.8 emu/g.3. PANI/TiO2 miro/nanospheres were prepared by using octahedral cuprous oxide as the template. TiO2 nano-particles are uniformly dispersed in polyaniline. The effects of molar ratio of TiO2/AN on morphology, electrical properties and the chemical structure of PANI/TiO2 composites were studied. The results showed that the average diameters of PANI/TiO2 composites became smaller and smaller with the TiO2/AN molar ratio increasing, The average diameters decreased from 373nm to 80nm when TiO2/AN molar ratio increased from 0.16 to 1.6. The room-temperature conductivity of PANI/TiO2 composite increased from10-4 S/cm to 100 S/cm when TiO2/AN molar ratio changed from 0.16 to 1.6. The morphologies and chemical structures of the products were used scanning electron microscopy, transmission electron microscopy, infrared absorption spectroscopy and X-ray diffraction were characterized.
Keywords/Search Tags:polypyrrole, 3, 4-Polyethylenedioxythiophene, Polyaniline/TiO2 composites, chemical one-step method, electro-magnetic function
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