Study On V₂O₅ Xerogel And Water-Soluble Polypyrrole/V₂O₅ Nanocomposite Materials

The development of polymer-inorganic nanocomposites has been reviewed in detail. It was proposed that organic-inorganic nanocomposite materials could provide a new remarkable opportunity to obtain materials with improved properties. Considering economical and environmental factors,we try to synthesize the water-soluble polypyrroleAOs nanocomposite materials on the basis of precursors research work. From many experiments,the water was adopted as solvent in the synthetic process of nanocomposite materials. Fabrication of sol-gel system,the structure and performances of the VOs films,as well as their relationship have been studied. The synthesis of water-soluble pyrrole and poly(trimethyl-(2-pyrrol-l-yl-ethyl)-ammonium iodide)/ ViOs nanocomposite was studied systemically. The VOs xerogel was prepared by melt quenching method and the fabrication method was improved. Two kinds of N-substituted pyrrole (trimethyl-(2-pyrrol-l-yl-ethyl)-ammonium iodide and 2-(2-pyrrol-1-yl-ethoxy)-ethane- sulfonate sodium) were synthesized;poly(trimethyl-(2-pyrrol-l-yl- ethyl)-ammonium iodide)/ V2Os nanocomposites were synthesized by two methods (monomer in-situ intercalate polymerization and polymer intercalation in solvent).To fabricate VaOs sol by melt quenching,Oxygen top-blend technique was applied to improve oxygenic part-pressure,decrease the oxygenic anoxic and restrain the increase of V4+ ion when vOs was melted. The XOs xerogel prepared by the new technique had more complete structure than the VOs xerogel which V20s powder was melted in the air. The major results were listed below:The forming processing of XOs xerogel was studied. The results showed that it is useful to apply the oxygen top-blend technique to the fabrication of VaOs xerogel by melt quenching. The DSC curve and XRD of VO xerogel revealedthat three-change process during the drying process of XOs sol. The as-prepared 265 xerogel was amorphous. Annealing at higher temperature resulted in structural crystallizing and emersion of layered water. The VOs xerogel by oxygen top-blend was less crystallizable than the XOs xerogel by melted in the air.The effect of factors on the two kinds XOs xerogel had been discussed according to the FT-IR result,XPS and the colloidal chemistry theory. It was concluded that this two kinds of 265 xerogel were no distinguished difference at 530cm1 absorbing peak. Several combined form of oxygen (V=O V-O-V,V-O-H) occurred in the "VOs xerogel. The results fritted branches of Ois 2a in V2O5nH2O xerogel films confirmed that content of V5 V4+were 70.55% 29.33% in sample A and 66.25%,33.74% in sample B.SEM was applied in studying the morphology of the films. The surface structure of sample A would be more regulate and complete than sample B after annealing.TGA was applied to analyze the weight loss process of ViO xerogel. During the temperature of 360410,the weight lose was aboutl.8% of both sample A and sample B . The calculating result of n (water molecular number) was n=1.59(sample A),n=1.79(sample B) respectively.Li+ ion storage properties in XOs xerogel films were related to the content of V5+ ion and the situation number that Li+ ion were capable to hold. Li+ ion storage properties were related to the annealing temperature too. Low annealing temperature would increase Li+ ion storage capacity and high annealing temperature would increase Li ion storage capacity. Current peak remove to high voltage when Li+ ion was intercalating;whereas current peak remove to low voltage when Li+ ion was deintercalated during the annealing temperature increasing.Synthesis of trimethyl-(2-pyrrol-l-yl-ethyl)-ammonium iodide and 2-(2 -pyrrol- 1-yl- ethoxy)-ethane-sulfonate sodium were studied. This two kinds of N-substitute pyrrole were water-soluble. The synthesis of poly(trimethyl-(2-pyrrol-l-yl-ethyl)-ammonium iodide)/ VaOs nanocomposite was studied .The nanocomposites were prepared by monomer in-situ polymerization or polymer solution intercalation. The structures of nanocomposites were analyzed. The polymer intercalate...