| A surfmer designed and synthesized in advance was introduced to St disperse polymerization to prepare symmetrical functional core-shell particles. Meanwhile, asymmetrical Janus particles on surface composition and/or property were prepared in UV field.The dispersion polymerization of styrene was studied at 70℃with HVV which was tailored and syntheised as stabilizer, AIBN as initiator, mixing solvent of methanol/water as disperse media. And the monodisperse antibacterial core-shell microspheres were obtained by this single one-step polymerization. The formation mechinsm of core-shell particles was proposed as a result of HVV moderate hydrophile and reaction activity. What is more, the reaction parameters including dispersant concentration, monomer concentration, initiator concentration and disperse media were investigated which could make effects on microspheres diameter, diameter distributing, as well as thickness of core and shell. Several measures were carried out to enhance the HVV content combined on the surface of particles. The phenomenon was better by one-step feeding, two-step growth, adjusting solvent and adsorbing metal nanoparticles and so on.The more HVV grafted on particles surface meas better antibacterial activity.In addition, polymeric Janus particles are obtained by UV-induced selective surface grafting modification, in advance of immobilizing photoinitiator and droping monomer solution on the surfaces exposing to UV light. And some related reaction factors such as initiator and monomer were studied in this system. |
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