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

Abstract : 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.
Type de document :
Article dans une revue
Journal of Applied Polymer Science, Wiley, 2000, 75 (13), pp.1667-1683
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-00366399
Contributeur : Nida Sheibat-Othman <>
Soumis le : vendredi 6 mars 2009 - 17:23:43
Dernière modification le : jeudi 19 avril 2018 - 14:46:15

Identifiants

  • HAL Id : hal-00366399, version 1

Collections

Citation

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, Wiley, 2000, 75 (13), pp.1667-1683. 〈hal-00366399〉

Partager

Métriques

Consultations de la notice

121