Abstract
Abstract The emulsion polymerization of styrene in the presence of an amphoteric emulsifier of the amino acid type, N-lauroyl-1-N, N-dimethyllysine (DMLL), has been studied at various pH values. The polymerization rate and the particle number concentration increased with increasing pH of the aqueous DMLL solution and these curves changed in slope at approximately pH 4 and pH 9. The physicochemical properties of the aqueous DMLL solution, such as CMC and the aggregation number, changed with the pH and similarly changed in slope at almost the same pH as the emulsion polymerization. These pH values were in good agreement with the pH at which the ionic form of the DMLL molecule changes. The number of latex particles formed changed in proportion to the number of DMLL micelles in the solution. The particle size and the molecular weight of the synthesized latex particles were also dependent on the physicochemical solution properties accompanying the change in the ionic forms of DMLL.
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