The Study Of Styrene And Its Copolymer Microspheres Prepared By Dispersion Polymerization

In this paper, the preparation of styrene and its influencing factorswas firstly introduced. PS monodisperse microspheres were synthesizedby anionic polymerization and in this polymerization n-butyl lithium asinitiator, made of styrene butadiene rubber (SSBR) as a dispersing agent,hexane as the dispersion medium. The role of the selection of thedispersant, the dispersant, initiator monomer concentration, andtemperature in the polymerization was discussed. When the conditions of60°C, the amount of n-butyl lithium is2%(wt), the amount of SSBR is5%(wt), the monodisperse polystyrene microspheres can be prepared,whose particle size is1.8~2.5μm.Polyvinylpyrrolidone (PVP) as dispersant, benzoyl peroxide (BPO)as initiator, ethanol/water mixture as the dispersion medium, St/BAdispersion copolymerization was carried out at a certain temperture. Theeffects of initiator concentration, dispersant concentration, reactiontemperature and initial monomer concentration on the polymermicrospheres particle size and size distribution were investigated. Whenthe monomer concentration of St is1mol/L, temperature is65°C, theamount of BPO is2%(wt), the monodisperse St/BA copolymermicrospheres were prepared whose particle size is about2.4μm.BPO as initiator, PVP as dispersant and ethanol/water mixture as thedispersion medium, St/BA colymerization microspheres were prepared atsuitable temperature. The Influential factors of copolymer microspheresparticle size and size distribution were investigated. When the reactiontemperature is70°C, the monomer concentration of St is1mol/L, the amount of BPO is2%(wt), the monodisperse St/MMA copolymermicrospheres were prepared whose particle size is micron level.BPO as initiator, PVP as dispersant and isopropyl alcohol as thedispersion medium, styrene/maleicanhydride copolymerizationmicrospheres were prepared， and observed its morphologicalcharacterization.