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    Unexpected Secondary Nucleation in Poly(Vinyl acetate) Nanoparticle Synthesis by Ab Initio Batch Emulsion Polymerization Using Poly(Vinyl alcohol) as Surfactant

    Year: 2019

    Journal: Macromol. React. Eng., Volume 13, OCT

    Authors: Rocha-Botello, Gabriela; Olvera-Guillen, Roberto; Herrera-Ordonez, Jorge; Cruz-Soto, Martha; Victoria-Valenzuela, David

    Organizations: Universidad Nacional Autonoma de Mexico through "Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica" (PAPIIT)Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT) [IA103717]

    Keywords: emulsion polymerization; free-radical entry; polymer nanoparticles; PVA; secondary nucleation; vinyl acetate

    Kinetic aspects of the vinyl acetate ab initio batch emulsion polymerization using poly(vinyl alcohol) to produce polymer nanoparticles are studied. The initial nucleation step is followed by limited coagulation and then by the generation of new particles. It seems that this is the first report of secondary nucleation phenomenon occurring in the system under study in batch mode. To explain this phenomenon, a mathematical model that allows to determine whether certain polymerization conditions and the presence/absence of a steric barrier, can lead or not to significant secondary nucleation is developed. It is deduced that the effect of such steric barrier on the free-radical entry process plays a key role on the observed phenomenon.
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