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Micelle formation of polyoxyethylene‐polyoxypropylene surfactants
Author(s) -
Schmolka Irving R.,
Raymond Arthur J.
Publication year - 1965
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/bf02636916
Subject(s) - micelle , pulmonary surfactant , critical micelle concentration , copolymer , cloud point , surface tension , krafft temperature , sodium , chemistry , thermodynamics of micellization , polymer chemistry , organic chemistry , polymer , aqueous solution , thermodynamics , biochemistry , physics
Contradictory literature references on their micelle formation led to an investigation of block copolymers of ethylene and propylene oxides. By means of differential absorbance measurements of the dye‐surfactant complex, critical micelle concentrations (CMC舗s) for these polyols were determined. CMC values for surfactants with a molecular weight range of 1,100 to over 15,000 varied from 3.0 to 11.1 Ɓmoles per liter, which are much lower than for other nonionics normally encountered. Corroborative data were obtained by the surface tension depression method. An increase in temperature below the cloud point or the addition of sodium chloride resulted in an increase in the CMC, which is not usual for many nonionics.