Citation:
ZHANG Kai, HUANG Yu-Hong, FU Qiang, JIANG Lu-Xia, ZHOU De-Hui. The Feasibility of Repeated Use of Solvent in Dispersion Polymerization[J]. Chinese Journal of Applied Chemistry,
;2003, 20(10): 942-945.
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Monodisperse(dispersion coefficient ε≤0.05) polystyrene microspheres were prepared by dispersion polymerization in ethyl alcohol using polyvinylpyrrolidone(PVP) as a steric stabilizer and 2,2'-azo-bisizobutyronitrile as an initiator. Three batches of 3.0 μm monodisperse polystyrene microspheres were prepared with ethyl alcohol which has been used three times in recycling. The products were characterized by SEM and size analysis. The concentrations of reactants in three batches were examined by gas chromatography. The size of polystyrene microspheres and the dispersion coefficient were ε increased slightly with the times of solvent recycling(D1=3.02 μm, ε
1=0.02; D2=3.17 μm,ε2=0.03; D3=3.25 μm, ε3=0.05). But if the dispersion coefficient ε of polystyrene microspheres is beyond 0.05, the ethyl alcohol used must be purified in second batch. -
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