The Synthesis And Property Investigation Of Functional Composites Of Polystyrene Series

In this thesis, we focused on the synthesis and property investigation of functional composites of polystyrene series. Based on colloidal steric stabilization theory, heterocoagulation method and modified microemulsion polymerization, we successfully prepared two typical composites. Our products held advantages of both the facile synthetic methodology and perfect practical properties.The main contents in this thesis cover the following two aspects:(1) The controlled preparation and catalytic research of core-shell polystyrene/NMNPs compositesA series of core-shell composites of polystyrene and noble metal nanoparticles or their nanocomposites (NMNPs) were successfully fabricated via the ex-situ mode self-assembly. In the blending process, the as-prepared polystyrene microspheres and NMNPs were assembled based on the thermodynamically driving heterocoagulation. Other than some traditional synthetic mothods, our approach was needless of any surface functionalizations or modifications. The products were highly stable and controllable in their structure. Furthermore, they held excellent catalytic activity in some modal reactions. Thanks to their tiny size of NMNPs and great stability, the reaction rate was measured higher than some references by orders of magnitude, and the repeatability was also proved good. On the other hand, our topic is universal for a large class of similar systems, which is of great application value.(2) The synthesis of core-shell polystyrene/polyethylacrylate nanocomposites and their film forming research A series of styrene-acrylic microlatices were prepared via a two-step modified microemulsion polymerization. In this system, a relatively low surfactant amount, high solid content and tiny particle morphology were achieved, and the film forming process of such microlatex could proceed smoothly without any coalescent at room temperature. The film was intensively investigated including the thermal, optical and mechanical properties, all of which obtained several gratifying and disciplinary results due to its unique structure and content. The microlatex was creditably considered to be a potential raw material for the application of water-resistant paint.