Studies on Dispersion Copolymerization of St-AA-EGDMA for Preparing Monodisperse Micron-size Functional Microspheres

Abstract

Abstract: Dispersion copolymerization of styrene(St), acrylic acid(AA) as functional monomer and ethylene glycol dimethacrylate(EGDMA) as the crosslinking monomer was carried out in ethanol/water mixture as the media by using poly(N-vinylpyrrolidone)(PVP), 2,2-azo-bisisobutyronitrile(AIBN) as the stabilizer and initiator, respectively. Monodisperse micron-size crosslinked polystyrene microspheres-containing carboxyl were directly prepared by one-step method of dispersion copolymerization. Polymerization kinetics was researched and kinetics formula, R_p=k[I]^0.13([St]^1.87+[AA]^0.13+[EGDMA]^0.2)·({1+[PVP]^0.2)exp(-E/RT), was rendered. The effects of concentration of AA, EGDMA, PVP and solvent polarity on the carboxyl distribution were discussed in detail. The effects of concentration of AA and EGDMA on particle morphology, particle size and size distribution and carboxyl distribution were also researched.

Key words: Dispersion polymerization, Carboxyl, Polymer microsphere, Crosslinking

CLC Number:

O631

TrendMD:

ZHANG Hong-Tao, LÜ Rui, CHEN Min . Studies on Dispersion Copolymerization of St-AA-EGDMA for Preparing Monodisperse Micron-size Functional Microspheres[J]. Chem. J. Chinese Universities, 2004, 25(2): 366.

References

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