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Synthesis and kinetic studies of PMMA nanoparticles by non-conventionally initiated emulsion polymerization

Authors
Journal
European Polymer Journal
0014-3057
Publisher
Elsevier
Publication Date
Volume
39
Issue
9
Identifiers
DOI: 10.1016/s0014-3057(03)00090-9
Keywords
  • Non-Conventional Emulsion
  • Complex Catalyst
  • Kinetics
  • Nanoparticles
  • Ultrasonic Velocity

Abstract

Abstract The aqueous emulsifier-free emulsion polymerization of methyl methacrylate (MMA) was studied under the catalytic effect of in situ developed bivalent transition metal-EDTA complex with ammonium persulfate (APS, (NH 4) 2S 2O 8) as initiator. Out of these, Cu(II)-EDTA system was selected for detailed kinetic and spectrometric study of polymerization. The apparent activation energy E a, 34.5 kJ/mol, activation energy of initiator decomposition E d, 26.9 kJ/mol, energy of propagation E p, 29 kJ/mol and energy of termination E t, 16 kJ/mol were reported. The emulsion polymer (PMMA) latex was characterized through the determination of the size and morphology by scanning electron microscopy, the average molecular weight by GPC and viscosity methods and the sound velocity by ultrasonic interferometer. From the kinetic results, the rate of polymerization, R p at 50 °C was expressed by R p =K[ Cu( II)] 0.35[ EDTA] 0.69[ APS] 0.57[ MMA] 0.75

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