The polymerization of vinyl acetate in aqueous solution initiated by potassium persulphate at 60°C.

Abstract

Polyvinyl acetate precipitates from aqueous solution as it is formed. When potassium persulphate is used as initiator the polymer suspension is stable and constitutes the principal locus of reaction. The effect of reaction conditions on the rate of polymerization and on the number of particles formed ha5 been studied. The surface charge density appears to be the factor which determines the number of particles formed and which limits the rate of reaction.ZUSAMMENFASSUNG:Polyvinylacetat f a t bei seiner Bildung aus wainriger Losung aus. Bei Verwendung von Kaliumpersulfat als Initiator ist die Polymersuspension bestandig und stellt den hauptsachlichen Ort der Reaktion dar. Der Eidul3 der Reaktionsbedingungen auf die Polymerisationsgeschwindigkeit und auf die Zahl der sich bildenden Polymerteilchen wird untersucht. Es scheint, dal3 die Oberflachedadungsdichte die Zahl der Polymerteilchen bestimmt und auch die Reaktionsgeschwindigkeit begenzt.

Emulsion Polymerization of Vinyl Acetate

“…This was evident in persulfate 96 and radiolysis-initiated emulsion polymerizations 92 . A dependence on initial monomer concentration has also been reported 97 .…”

“…Dunn and Taylor 96 showed that, in the surfactant-free polymerization of an aqueous solution of VAc, a latex formed and its final particle number increased with persulfate concentration. Their explanation was the generally accepted notion that the charged end group derived from the initiator confers sufficient colloidal stability to form a stable latex.…”

“…Dunn and Taylor 96 showed that the inhibition period was primarily due to dissolved oxygen. Furthermore, they showed that, apart from the length of the inhibition period, exclusion of oxygen had no other effect on the progress of VAc emulsion polymerization.…”

Emulsion grafting of vinyl acetate onto preirradiated poly(3‐hydroxybutyrate) film

“…Other researchers suggested that polymerization primarily occurs in the monomer-swollen polymer particles. [18][19][20][21] Thus, the graft polymerization of VAc was performed with water as a solvent.…”

Effect of polyoxyethylene emulsifier composition on the course of emulsion polymerization of vinyl acetate

“…This speed is in the range where the agitation has no noticeable e †ect on the rate of polymerization. 15 Samples of the reaction mixture were taken at various time intervals. These samples were very small so that the overall composition in the reaction vessel was not seriously a †ected.…”