The Synthesis And Property Investigation Of Polymer/nobel Metal Nanoparticles

This thesis aims to develop a facile and efficient route for the controllable synthesis of nobel metal polymer composite particles. A series of composite particles with excellent properties were successfully prepared through various methods. The article was introduced mainly in two aspects according to the polymer species.(1) The synthesis of silica hollow particles (SiO2HPs)SiO2 HPs modified with different functional groups were successfully fabricated through a one-step inverse emulsion system. With different kinds of functional groups, the SiO2HPs were used in different combination systems.Those modified with aminopropyl were used to prepare SiO2HP-K/AgNPs composites. The silver ions were first hydrolysis and pyrolysis in-situ on the surface of SiO2HP-K and then reduced by subsequent reaction to obtain the final product. Owing to the specific preparing process, the AgNPs with a quite small diameter were anchored firmly onto the hollow silica spheres, leading to an outstanding catalytic activitie toward aromatic nitro.Those modified with aminopropyl and vinyl were used to prepare SiO2HP-KV/TS composites, where TS represents the temperature-sensitive polymer P(NIPAM-EA-MBA). MTT method was applied to evaluate the biocompatibility of the obtained materials.(2) The synthesis and catalysis research of Polystyrene/PtNPs compositesA series of binary composites particles of blueberry like structure were fabricated via a thermodynamic driving heterocoagulation progress where blending the main body particles polystyrene microspheres with the object particles Pt nanoparticles (PtNPs). There is no need to modify the PS microspheres since the driving force is thermodynamics based on colloid stability theory instead of traditional electrostatic interaction or electrostatic chemical reaction, resulting in a facile and rapid preparing process. In the colloid stability system, the hydrophilic metal nanoparticles (MNPs) assembled onto the PS microspheres self-driven, acting as the steric stabilizer to decrease the Gibbs free energy. The stability of PS microspheres could be affected by simply adjusting the species of dispersing agents thus to control the coating ability of object particles. Under the guidance of the above theory, we have synthesized a series of PS/PtNPs and PS/mPtNPs composites, and the catalytic reducing reactions of aromatic nitro were used to study the factors involved in catalytic properties of the composites.