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Surface‐tension properties of some polydispersed alkyl‐substituted polyoxyethylated phenylsulfonamides
Author(s) -
Hampson J. W.,
Cornell D. G.
Publication year - 1996
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02517991
Subject(s) - surface tension , critical micelle concentration , micelle , alkyl , aqueous solution , chemistry , gibbs isotherm , organic chemistry , thermodynamics , physics
Twenty‐nine laboratory‐prepared polydisperse nonionic surfactants, derived from polyoxyethylated N ‐alkylphenylsulfonamides [ R ϕSO 2 N( R′ ) (EO) n H], have been characterized. EO is ethyoxylation; R is hydrogen, n ‐butyl or t ‐butyl; R′ is hexyl, octyl, or decyl; and (EO) n is varied from (EO) 4 to (EO) 20 . Surface tension in aqueous solution was studied. The critical micelle concentration, surface excess, minimum area per molecule, effectiveness of surface‐tension reduction, and free energy of micelle formation were calculated from the surface‐tension measurements. The critical micelle concentrations for the derivatives in which R′ ‐hexyl were considerably higher than the corresponding derivatives where R′ is octyl or decyl. The greatest surface‐tension reduction was found in the R′ = n ‐octyl derivatives where R is t ‐butyl with (EO) 9 or n ‐butyl with (EO) 11 .