Emulsifier-Free All-Sulfonate Polystyrene Colloids from a New Peroxide Initiator
A new initiator, disodium Bis(4-sulfomethyl benzoyl) peroxide, has been synthesized and used for the emulsion polymerization of styrene in the absence of emulsifiers. The effects of variation of ionic strength, monomer, and initator concentrations on the size and final number of latex particles synthesized at 85°C have been studied. It was found that the particle size increased with increasing ionic strength and amount of monomer and decreased with increasing initiator concentration. The ion-exchanged latices were characterized by means of HOTS, conductometric and potentio-metric titrations for particle size and surface charge densities. From the titration curves, only strong acid surface groups were found on the latex particles. The latex surfaces were analyzed by ion scattering spectroscopy and were found to contain carbon, sodium, oxygen, and sulfur.
KeywordsIonic Strength Emulsion Polymerization Latex Particle Monomer Concentration Surface Group
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