This water-in-oil emulsion is then dispersed in an aqueous phase containing protective colloids [poly (vinyl alcohol) (PVA) and hydroxyl ethyl cellulose (HEC)1, and a final water-in-oil-in-water double emulsion is obtained.
Despite the presence of the protective colloids at the surface, droplet collisions originate temporary agglomeration.
The purpose was to verify whether some interaction between the catalyst system, the added amine, and the protective colloids could be contributing to the observed viscosity changes.
The emulsifying action of substances of high molecular weight, such as gelatin, casein, polymethacrylic acid, methylcellulose and polyvinyl alcohol, and their action as protective colloids
, can be best explained by the colloid dispersion.
The organic phase is emulsified in an aqueous solution of poly (vinyl alcohol) (PVA) and hydroxyl ethyl cellulose (HEC), which act as protective colloids.
These protective colloids were dissolved in water at 80[degrees]C, stirring for 1 h to achieve complete dissolution.