The Hollow Nanometer Tio < Sub > 2 < / Sub > / Organic Composite Microsphere Preparation And Characterization Of "click Chemistry"

In recent years, more and more researchers paid attention to inorganic/organic nanocomposites. The hollow inorganic microspheres have a larger surface area and the relatively strong interfacial interaction, so the thermal properties, mechanical properties, electrical properties, optical properties and magnetic properties of the nanocomposites are different from the general composites. At the same time, the inorganic/polymer composite nanomaterials have many advantages compared with the inorganic nanomaterials, such as environmental responsible, environmental friendly properties and biocompatibilities. The "click" chemistry is one of the most popular methods of preparation of inorganic/polymer nanocomposites. While azido was modified on the nanomaterials’surface as the reaction groups, and The polymer with propargyl end groups was synthsized via atom transfer radical polymerization as another reaction groups, the polymerization on the surface of the inorganic nanomaterials’could be realized through "click" chemistry method.Based on the studies above, we used a facile template method to fabricate hollow TiO2nanospheres with polystyrene spheres and tetrabutyl titanate, and The surface of hollow TiO2spheres were modified by the azido groups. The poly (N,N-diethylamino ethyl methacrylate)(PDEAEMA) with propargyl end groups was synthsized via atom transfer radical polymerization (ATRP), and grafted on hollow TiO2nanospheres surface via "click" chemistry. The PDEAEMA brushes were reacted with CH3I to form quaternized-PDEAEMA (Q-PDEAEMA) so as to facilitate exchange with noble metal anions, which was followed by in situ reduction to form the noble metal nanoparticles (Pt, Au, Pd) on the surface of hollow TiO2nanospheres. This thesis mainly includes the two parts as follows: The polystyrene spheres were synthetized via micro emulsion polymerization, we studied the influence of the initiator dosage and stirring rate to the radius of sphericity; ethylene glycol and TBT(Tetra-n-butyl Titanate) reacted to obtain the precursor of titanium, and then further to obtain PSt/TiO2core-shell structure. We used tetrahydrofuran and calcinations two ways to remove the PSt core to obtain hollow TiO2nanospheres. XRD showed that the hollow TiO2nanospheres were mainly anatase; they had a uniform particle size, scattered good.The surface of hollow TiO2spheres were firstly modified by the dopamine bromide, and then we put them together with NaN3in N,N-dimethylformamide (DMF) to get TiO2-azide; The poly (N, N-diethylamino ethyl methacrylate)(PDEAEMA) with propargyl end groups was synthsized with propargyl amine via atom transfer radical polymerization, and grafted on TiO2nanospheres surface with azide groups via "click" chemistry. The obtained PDEAEMA brushes were reacted with CH3I to form quaternized-PDEAEMA (Q-PDEAEMA) so as to facilitate exchange with noble metal anions, which was followed by in situ reduction to form the noble metal nanoparticles (Pt, Au, Pd) on the surface of hollow TiO2nanospheres. The results indicated that the PDEAEMA was grafted on the surface of hollow TiO2nanospheres. The results of TEM and XPS indicated that noble metal nanoparticles (Pt, Au, Pd) were doped on the surface of hollow TiO2nanospheres. UV results indicated that the hollow spheres TiO2-g-PDEAEMA had pH-responsive.