Issue 10, 1984

A study of the kinetics of the emulsion polymerization of butyl methacrylate

Abstract

The kinetics of the emulsion polymerization of butyl methacrylate at 50 °C have been studied dilatometrically. Thermal initiation, γ-radiolysis initiation and initiation by K2S2O8 were employed, the last over a wide concentration range. Rates were obtained for the steady state, for the approach to steady state and (for γ-radiolysis initiation) for the decay from steady state on removal from the radiolysis source. These data yield unambiguous and accurate values for the rate coefficients for free-radical propagation, exit (desorption), entry (as a function of initiator concentration) and bimolecular termination. It is found that aqueous-phase kinetics are characterized by re-entry of desorbed free radicals into the particles and by a capture efficiency of primary free radicals that is significantly less than 100%. Exit is found to be a transfer-diffusion-dominated process. The system has a comparatively high average number of free radicals per latex particle (e.g. ca. 0.7 for [S2O2–8]= 10–3 mol dm–3). The methodology presented here should be applicable to other emulsion-polymerization systems.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 1, 1984,80, 2851-2865

A study of the kinetics of the emulsion polymerization of butyl methacrylate

L. F. Halnan, D. H. Napper and R. G. Gilbert, J. Chem. Soc., Faraday Trans. 1, 1984, 80, 2851 DOI: 10.1039/F19848002851

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