Summary
The effect of stirring speed (SS) on the kinetics of styrene emulsion polymerization at 70 °C, using SDS as surfactant and KPS as initiator, was studied. The conversion (x) and weight average molecular weight (Mw) results are higher in the optimum SS range, which seems to be strongly dependent on the hydrodynamic characteristics of the reactor and the polymerization conditions. Above the optimum SS range, the number of particles and Mw are lower, therefore limited coagulation lead to a decrease in Mw caused by the increment of the free-radical entry frequency. These radicals not only come from the aqueous phase (oligomeric radicals), but also come from the radicals contained in the particles subject of coagulation (coagulative entry).
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References
Nomura M., Harada M, Eguchi W Nagata (1972) J Appl Polym Sci, 16:835
Zubitur M, Asua JM (2001) J Appl Polym Sci, 80:841
Herrera-Ordonez J, Rivera O, Maldonado-Textle H, Ramírez JC (2005) J Polym Sci Part A: Polym Chem (to be published)
Zubitur M, Asua JM (2001) Polymer 42:5979
Kemmere MF, Meuldijk, J, Drinkenburg AAH, German AL (2001) J. Appl Polym Sci, 79: 944.
Krishnan S, Klein A, El-Aasser MS, Sudol ED (2004) Ind & Eng Chem Res, 43:6331.
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Ramirez, J., Herrera-Ordonez, J. & Maldonado-Textle, H. Kinetics of the styrene emulsion polymerization above cmc. II. Agitation effect on molecular weight. Polym. Bull. 53, 333–337 (2005). https://doi.org/10.1007/s00289-005-0354-9
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DOI: https://doi.org/10.1007/s00289-005-0354-9