Surface and interfacial FT‐IR spectroscopic studies of latexes. VII. EA/MAA latex suspension stability and surfactant migration

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Abstract
This article, part VII in a series of latex studies, focuses on the effect of ethyl acrylate/methacrylic acid (EA/MAA) latex stability on the exudation of sodium dioctyl sulfosuccinate (SDOSS) surfactant molecules after coalescence. It is found that “aging” of the latex aqueous suspension causes excessive exudation of the surfactant molecules to the film‐air interface. Upon exudation to the surface, the surfactant SO Na+ hydrophilic heads assemble in preferentially normal‐to‐the‐surface directions, whereas hydrophobic aliphatic tails are randomly burred in the latex surface. ATR FT–IR spectroscopy and a particle size analysis are utilized to elucidate the effects of flocculation and coalescence on the surfactant mobility in latex films. It appears that flocculation, prior to coalescence, enhances exudation and mobility of the surfactant molecules. © 1993 John Wiley & Sons, Inc.