D. Donescu et al., EMULSION POLYMERIZATION OF VINYL-ACETATE - INTERACTION BETWEEN SURFACTANT, MONOMER, AND INITIATOR, Journal of dispersion science and technology, 17(3), 1996, pp. 251-262
During emulsion polymerization of vinyl acetate (VAc) specific interac
tions surfactant-monomer and surfactant-initiator has been evidenced.
Due to this interactions the cmc of the surfactant is higher and the e
lectrical conductivity sharply decreases at surfactant/initiator molar
ratio = 1. At this ratio high chemical interaction between surfactant
and initiator has been observed. The surfactant was dissodium salt of
the sulfosuccinic acid with nonyl phenol ethoxylated having 25 moles
ethylene oxide (NPED 25SS) and the initiator was potassium persulfate
(KPS). The surfactant-monomer interaction reduces the concentration of
free surfactant and consequently the rate of initiator decomposition.
For the polymerization reaction, the initiator productivity is higher
at lower surfactant concentration. At a surfactant/initiator molar ra
tio = 1 this productivity is smaller at constant surfactant concentrat
ion.