Adsorption of Ionic Surfactant on Polystyrene Particles in the Absence and Presence of Cosurfactant

G. Tuin, H.N. Stein

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20 Citations (Scopus)
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Abstract

The adsorption of Na dodecylbenzenesulfonate (I) on polystyrene particles was investigated. Monodisperse polystyrene particles were prepd. by a 1-step surfactant-free emulsion polymn. and their size varied from 0.4 to 3 mm. The surface charge d. (scd) varied with particle size. Differences in the scd had an effect on the adsorption behavior of I only at very high scd. The areas per adsorbed I mol. were detd. by Maron's soap titrn. method and were 50-60 .ANG.2 at 22 Deg and 60-80 .ANG.2 at 60 Deg for the latexes depending on the scd. The higher areas per adsorbed mol. at higher temps. were explained by the larger thermal motion of the adsorbed mols. The addn. of long-chain fatty alcs. (cosurfactants) such as dodecanol or cetyl alc. influenced the adsorption behavior of I. When the alcs. were added at low alc.-I ratios, there was only little influence, whereas at higher ratios the av. area per adsorbed mol. of I decreased sharply. This was explained by the fact that when adding alcs. there was a pos. attraction between the tails of I and alc., without simultaneously introducing addnl. repulsion through neg. charged groups. This pos. effect was more pronounced at larger alc.-I ratios than at lower ratios. At higher temps. smaller av. areas per adsorbed I mol. were found. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)1054-1059
JournalLangmuir
Volume10
Issue number4
DOIs
Publication statusPublished - 1994

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