Preparation Of Polystyrene/ZnO Composite&Porous Polystyrene/ZnO Nanocomposite Materials Via Concentrated Emulsion

In this study, the polystyrene （PS）/ZnO、PS/Butyl Methacrylate（BMA）/ZnOmicrosphere particle, PS/BMA/Octamethyl cyclotetrasiloxane（D₄） polymercomposite materials and PS/ZnO porous material were successfully prepared byconcentrated emulsion. The effects of various ZnO contents on the emulsion stabilityand the properties of the resulting ZnO/polymer were investigated, and increasingthe interest of its further investigation and applications.（1）The ZnO nanoparticles were firstly treated with n-Butyl Oleate agent to generatehydrophobic group on their surface, and then dispersed in the styrene monomer by anultrasound. The PS/ZnO and PS/BMA/ZnO nanocomposite were obtained bypolymerization of oil-in-water concentrated emulsion containing, styrene （St/BMA）,Cetyl alcohol （HD） and n-Butyl Oleate coated ZnO nanoparticles as dispersed phase.We discussed the effects of various emulsifier concentrations, the ratio of theemulsifier and dispersed phase mass ratio on the emulsion stability. Scanning electronmicroscopy （SEM） and transmission electron microscopy （TEM） micrographsrevealed that the presence of ZnO nanoparticles,1-10%（by weight）, little influencedthe microstructure of polymer and the particle size uniformity is well with the sizeabout100nm. The nanocomposite materials were characterized using Fouriertransform infrared spectroscopy （FTIR）, X-Ray difratio （XRD）, thermogravimetry（TG） and Ultraviolet-variable （UV-Vis） spectra. The PS/ZnO exhibited higherabsorption （300to400nm） than the pure PS. It was found the incorporation of themodification of ZnO nanoparticles had well dispersion in Blends（PS/ZnO/StyreneicBlockCopolymers （SBS）、 PS/BMA/ZnO/SBS） matrix and enhanced mechanicalproperty with increasing the ZnO mass ratio.（2） We present macroporous low density nanocomposites produced by polymerizingthe continuous phase of emulsion templates, which contained styrene （St/BMA） andn-Butyl Oleate coated ZnO nanoparticles, Triallyl isocyanurate（TAIC） acted as crosslinker. It was discussed the effects of various emulsifier concentrations,temperature, dispersed phase concentrations and dispersed phase mass ratio on theemulsion stability by Orthogonal experimental. The results revealed that the bettercondition: emulsifier concentration,10%; temperature,50°C; dispersed phaseconcentration （CaCl₂2H₂O）,0.3mol/l; the dispersed phase mass ratio,85%. SEManalysis showed that the presence of ZnO nanoparticles had little influenced themicrostructure of polymer and the porous size is about5μm. The macroporousmaterials were characterized using FTIR, XRD, TG and Ultraviolet-variable （UV-Vis）spectra. Under the condition of the sample in the UV of methyl orange degradationrate was increasing with increasing ZnO ratio.（3） The PS/BMA/D₄latex particles were successfully prepared by concentratedemulsion and investigated the effects of ring-opening temperature of D₄on contactangle. TEM micrographs showed that the particle size is about400nm.