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Emulsification in batch‐emulsion polymerization of styrene and vinyl acetate: A reaction calorimetric study
Author(s) -
Kemmere M. F.,
Meuldijk J.,
Drinkenburg A. A. H.,
German A. L.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010131)79:5<944::aid-app180>3.0.co;2-5
Subject(s) - vinyl acetate , emulsion polymerization , styrene , emulsion , materials science , polyvinyl acetate , polymer chemistry , polymerization , chemical engineering , reaction calorimeter , monomer , dispersion (optics) , impeller , suspension (topology) , chemistry , polymer , organic chemistry , copolymer , composite material , calorimetry , thermodynamics , physics , engineering , mathematics , optics , homotopy , pure mathematics
Dispersion of liquid–liquid systems is commonly applied in industrial processes such as extraction, suspension, and emulsion polymerization. This article describes the influence of the quality of emulsification on the course and outcome of a batch‐emulsion polymerization of styrene and vinyl acetate. From visualization experiments and polymerizations in combination with reaction calorimetric studies, a critical impeller speed, N *, can accurately be determined for a particular reactor setup and a given recipe. The results show that styrene–water emulsions are more difficult to emulsify than vinyl acetate–water emulsions. In general, a large turbine impeller appears to be more effective in emulsifying monomer–water dispersions than a pitched‐blade impeller. In addition, for vinyl acetate emulsion polymerization, the possibility of premixing the reaction mixture has been investigated. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 944–957, 2001