Preparation and Properties of Monodisperse-Crosslinked PMMA Microspheres Prepared by the Microwave Irradiation Soap-Free Emulsion Polymerization
Under the microwave irradiation,polymethyl methacrylate(PMMA)microspheres were prepared by the soap-free emulsion polymerization using divinylbenzene as a crosslinking agent,potassium chloride as an electrolyte and potassium persulfate as an initiator.The effects of potassium persulfate and potassium chloride molarities on the mean particle sizes and polydispersity index of PMMA microspheres were studied.The relationships between the microwave power,the stirring speeds,the morphologies and particle sizes of PMMA microspheres were analyzed.The electrokinetic(Zeta)potential of PMMA emulsion was measured at different pH values.The results show that the surfaces of PMMA microspheres produce a negative charge,and the PMMA microspheres show a stable dispersion state.The prepared PMMA microspheres were spherical with particle sizes of 100-400 nm.The polydispersity index of the microspheres is less than 0.1 when the molarity of potassium persulfate is 5.69×10-3 mol/L and the molarity of potassium chloride is 1.03×10-2 mol/L.The force-displacement curves of PMMA microspheres prepared at the optimum process conditions were measured by atomic force microscopy and their elastomechanical properties were analyzed.
Polymethyl MethacrylateMicrowave RadiationSoap-Free Emulsion PolymerizationMonodisperseParticle SizePolydispersity Index
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