INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Bulk Prepolymerization of Styrene in the Presence of Polybutadiene. Determination of Grafting Efficiency by Size Exclusion Chromatography Combined with a New Extended Model
Autor/es:
CASIS, N.; ESTENOZ, D. A.; VEGA, J. R.; MEIRA, G. R.
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Referencias:
Año: 2008 vol. 111 p. 1508 - 1522
ISSN:
0021-8995
Resumen:
A bulk prepolymerization of styrene in the presence of PB for the production of high-impact polystyrene (HIPS) is analyzed and compared with an equivalent solution reaction described in Estenoz et al. (1999). The heterogeneous model by Casis et al. (2006) was extended to predict the bivariate distributions of the graft copolymer topologies; where each topology is characterized by the number of trifunctional branching points per molecule. The developed model assumes polymerization in 2 phases and required the adjustment of a single kinetic parameter. Grafting efficiencies determined by solvent extraction-gravimetry were compared with determinations obtained by deconvolution of size exclusion chromatograms of the total polymer. The chromatographic technique is fast and simple, but it requires of a representative polymerization/fractionation model.