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Article Dans Une Revue Journal of Applied Polymer Science Année : 2000

On-line Monitoring of Methyl Methacrylate-Vinyl Acetate Emulsion Copolymerisation

Résumé

An adaptive calorimetric method, coupled with state estimators for emulsion copolymerization, is shown to provide accurate, on-line information on the evolution of the composition and kinetics of an emulsion copolymerization. This method was evaluated for the emulsion copolymerization of methyl methacrylate-vinyl acetate (MMA-VAc) under nonisothermal conditions. In addition to providing on-line estimates of the number of moles of each polymerizing species in the reactor, the state estimator provides a value for a lumped kinetic parameter proportional to the product of nNp. This information can be combined with off-line measurements to study the evolution of polymerization kinetics and to explain the trends observed for the molecular weight distribution and glass transition temperatures. Values of n were found to vary from 0.5 to 30 for the homopolymerization of MMA. However, the presence of VAc in the copolymerizing system drastically reduces n. This can lead to a dramatic increase in the average molecular weight of the copolymer since it alters the ratio of propagation to termination in the polymerizing particles.

Dates et versions

hal-00366399 , version 1 (06-03-2009)

Identifiants

Citer

Amilton M. Santos, Gilles Fevotte, Nida Sheibat-Othman, Sami Othman, Timothy Mckenna. On-line Monitoring of Methyl Methacrylate-Vinyl Acetate Emulsion Copolymerisation. Journal of Applied Polymer Science, 2000, 75 (13), pp.1667-1683. ⟨10.1002/(SICI)1097-4628(20000328)75:13<1667::AID-APP12>3.0.CO;2-2⟩. ⟨hal-00366399⟩
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