Another perspective on the nitroxide mediated radical polymerization (NMRP) of styrene using 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and dibenzoyl peroxide (BPO)
Por:
Roa-Luna M., Nabifar A., Díaz-Barber M.P., McManus N.T., Vivaldo-Lima E., Lona L.M.F., Penlidis A.
Publicada:
1 ene 2007
Resumen:
Polymerization conditions for the bimolecular NMRP of styrene using TEMPO and BPO were revisited and expanded with the objective of creating a more complete and reliable source of experimental data for parameter estimation and model validation purposes. Three different experimental techniques were assessed for the NMRP of styrene. The reliability of results produced in vials with inert nitrogen atmosphere was evaluated, taking as reference the more reliable technique using sealed ampoules with inert atmosphere. Polymerization rate data obtained in vials could be considered reliable if monomer loss was taken into account, but the reliability of molecular weight data at high conversions may be questionable. Polymerizations at 120 and 130°C and with TEMPO to BPO, molar ratios of 0.9 to 1.5 were carried out. Comparison of the experimental data collected against predictions obtained with a detailed kinetic model previously reported in the literature suggest that either the present understanding of the reaction system is incomplete, or some of the kinetic rate constants reported in the literature are not accurate, or both. Guidelines on how to address and design future experimental and modeling studies are offered.
Filiaciones:
Roa-Luna M.:
Departamento de Ingeniería Química, Facultad de Química, Ciudad Universitaria, México D. F., Mexico
Nabifar A.:
Institute for Polymer Research (IPR), Department of Chemical Engineering, University of Waterloo, Waterloo, Ont., Canada
Díaz-Barber M.P.:
Departamento de Ingeniería Química, Facultad de Química, Ciudad Universitaria, México D. F., Mexico
McManus N.T.:
Institute for Polymer Research (IPR), Department of Chemical Engineering, University of Waterloo, Waterloo, Ont., Canada
Vivaldo-Lima E.:
Institute for Polymer Research (IPR), Department of Chemical Engineering, University of Waterloo, Waterloo, Ont., Canada
UNAM, Mexico
Lona L.M.F.:
Departamento de Processos Químicos, Universidade Estadual de Campinas, Faculdade de Engenharia Química, Campinas, São Paulo, Brazil
Penlidis A.:
Institute for Polymer Research (IPR), Department of Chemical Engineering, University of Waterloo, Waterloo, Ont., Canada
Institute for Polymer Research (IPR), Department of Chemical Engineering, University of Waterloo, Waterloo, Ont. N2L 3G1, Canada
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