ASA Emulsion Polymerization At Low Temperature And Polystyrene Pickering Emulsion Polymerization

The paper main research works and conclusions are as follows:1. The ASA resin by emulsion polymerization at low temperature. ASA resin byemulsion polymerization, free radical polymerization by water soluble redox reactionmechanism was studied; Reaction temperature on the PBA reaction rate and theinfluence of latex particle size was studied; the gel content, grafting rate and theinfluence of ASA core-shell morphology were studied by changing the amout ofcrosslinking agent HDDA. The results show that the water-soluble REDOX system(KPS/NaHSO3) was strong controllable in the reaction, and we can get a suitablespeed of polymerization and latex particle size under60℃by using the water-solubleREDOX system (KPS/NaHSO3), the water-soluble REDOX system (KPS/NaHSO3)can significantly reduce energy consumption in industrial production; When thecrosslinking agent HDDA dosage was0.8%, the grafting rate is the highest, and havegood gel, and the formation of the core-shell structure is very neat.2. The PS/SiO2resin modifying agent was prepared Pickering emulsionpolymerization in which the modified nano silicon dioxide was used as emulsifier,then PS/SiO2resin modifying agent and ASA resin was blended to prepareASA/PS/SiO2composite materials. The microstructure and mechanics ofASA/PS/SiO2was studied. The results show that the10%content of KH-570modification of hydrophilic lipophilic property of the nano silicon dioxide is moreappropriate, emulsion stability is good; The content of silica used in emulsion wascontrolled around2%-5%; The addition of nano-SiO2can obviously increase tensilestrength and tensile modulus of composite materials.3. PS/TiO2was prepared through Pickering emulsion polymerization in which themodification of titanium dioxide nanotubes was used as emulsifier, then PS/TiO2andASA resin was blended to prepare ASA/PS/TiO2composite materials. Themodification of titanium dioxide, the micromorphology of PS/TiO2, the mechanics ofASA/PS/TiO2composite material and the dispersing performance of TiO2in thematrix were studied. The results show that the m(KH-570)/m(TiO2)is0.15, themodification of TiO2nanotubes can self-assemble in styrene-water interface, thenstable Pickering emulsion was formed, and the of interface emulsion became stabilewith the increase of the amount of titanium dioxide nanotubes; The surface ofPS/TiO2composite microspheres was coated by a dense layer of TiO2nanotubes through Pickering emulsion polymerization; The titanium dioxide nanotubes inASA/PS/TiO2composite materials had good nanoscale dispersion, and the propertiesof ASA resin was enhanced through this methods, the impact properties of ASAresin,the tensile properties of ASA resin and the thermal stability of ASA resin isimproved.