Study On Template Synthesis Of Silica Nanotubes And Modified Urea-formaldehyde Furan Resin Of Carbon Nanotube

Carbon nanotubes (CNTs) is the typical one-dimensional (1D) nanomaterial which possess perfect structure. Owing to its special physical structure, outstanding performance and wide application,CNTs has been paid great atttion. Thechemical character of CNTs is very stable which could endure the violet acid,voilet alkali and don't be oxidated below 700℃in air. Combining with the factors, CNTs are believed to be the ideal and limited type materials for nanocomposites, and can be used to make excellent composites with remarkable performance. But, CNTs is easy to agglomerate due to their high surface energy, which make the application of CNTs limited. So, it is very hot that study the alterperformance and application of CNTs. In this paper, focusing on the preparation and the properties of CNTs nanocomposites, a series of work is as following:1,Silica nanotubes were synthesized using the multi-walled carbon nanotubes (MWCNTs) as the template. The as-obtained samples were characterized by Infrared spectroscopy (FTIR), X-ray diffraction (XRD), Transmission electron microscopy (TEM), Field emission scanning electron microscope (FE-SEM) and Photoluminescent (PL) spectroscopy. The results indicate that silica nanotubes have a smooth-sided, the average diameter of silica nanotubes is in the range of 50-70 nm. The thickness of the outer walls is about 10 nm and the inner diameter is completely dependent on the size of the MWCNTs. The as-fabricated silica nanotubes emit a strong violet light under excitation of 250 nm.2,Owing to their hollow structure and high surface area of silica nanotubes, we expect to get the more efficient nanocomposites catalyst through depositing metal particle onto silica nanotubes surface. After investigation, The MWCNTs in this composites not only act as the template for the formation of silica, but also are efficient reduction for the in-situ reduction of [Ag (NH₃)₂] NO₃ to Ag nanoparticles. The Ag/SiO₂ nanotubes composites showed an excellent electrocatalytic activity for methanol oxidation.3,The urea-formaldehyde furan resin were prepared with formaldehyde, urea and furfuryl alcohol as the main raw material. The content of the nitrogen come from the urea, the weight tatio of urea and formaldehyde is about 1:1.1, The slower of adding urea, the lower of the free formaldehyde, the addition of ammonia also effectively reduce the free formaldehyde.4,The functionalization of multi-walled carbon nanotubes (MWNTs) was achieved by grafting furfuryl alcohol (FA) onto surfaces of the MWNTs. Furthermore, the functional MWNTs were incorporated into the poly(furfuryl alcohol) (PFA) resin and the tensile strength of resultant PFA composite coatings were investigated. The results indicated that the functionalization led to an improvement in the dispersion of MWNTs and the tensile strength of PFA composite coatings. When the mass percent of MWNTs is 0.8%, the strength of resin is perfect.