The kinetics of emulsifier-free emulsion polymerization of vinyl acetate using the redox initiation system of potassium persulfate-potassium metabisulfite was studied. The effect of the reaction conditions on the rate of polymerization was also investigated. The polymerization proceeded smoothly unt
Study of the parameters affecting the emulsion polymerization of vinyl acetate
β Scribed by A. S. Badran; A. A. Yehia; A. B. Moustafa; S. M. M. Shendy
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 886 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0323-7648
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β¦ Synopsis
The kinetics of emulsion polymerization of vinyl acetate using the redox system potassium persulfateacetone sodium bisulfite as initiator is studied. The effect of the reaction conditions on the rate of polymerization and on the number and size of the formed particles is established. The polymerization proceeded smoothly till high conversion and yielded stable emulsions. The apparent activation energy for the polymerization system has been calculated.
Untersuchungen zur Emulsionspolymerisation von Vinylacetat
Die Kinetik der Emulsionspolymerisation von Vinylacetat bei Initiierung mit einem Redoxsystem aus Kaliumpersulfat und Acetonnatriumbisulfit wurde untersucht. Der EinfluB der Reaktionsbedingungen auf die Polymerisationsgeschwiridigkeit sowie die Anzahl und GroBe der gebildeten Teilchen wurde ermittelt. Die Polymerisation verlief stetig bis zu hohem Umsatz und ergab stabile Emulsionen. Die scheinbare Aktivierungsenergie dieses Polymerisationssystems wurde berechnet.
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π SIMILAR VOLUMES
The emulsion polymerization of vinyl acetate was studied a t 50Β°C. It was found that the rate of polymerization was proportional to the 0.5 power of the initiator concentration and the 0.25 power of the number of particles. The number of particles was proportional to the power 0.5 f 0.05 of the emul
Transport of free radicals out of latex particles into the aqueous phase plays an important role in the emulsion polymerization of vinyl acetate. This so-called "desorption" process involves chain transfer to monomer which generates a mobile an8 rather stable monomer-unit free radical followed by th
## Abstract The kinetics of vinyl chloride and vinyl acetate emulsion polymerization are reexamined. The validity of Ugelstad's model for systems with high desorption rate is confirmed by simulating conversion histories for both systems at different initiator concentrations and particle numbers. On