Two-stage latexes of polystyrene acrylates

The modification of decomposition rate of the potassium persulfate initiator during the synthesis of "two-stage latexes": polystyrene-ethyl acrylate (EtA) of butyl acrylate (BuA) and of 2ethylhexyl acrylate (EHA) is studied. This rate is minimum for BuA and maximum for EHA, in good agreement with the value of solubility parameters. The appearance of polyacrylates determines the existence of water bonded to the polar polymer. The amount of water bonded increases in the sequence PEtA>PBuA>PEHA, function of the modification of the diameters of the particles resulted from the latexes obtained.