caa a22 4500 465796702 CHVBK 20180323112040.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF02540642 doi (NATIONALLICENCE)springer-10.1007/BF02540642 Relationship of structure to properties of surfactants. 15 Isomeric sulfated polyoxyethylenated Guerbet alcohols [Elektronische Daten] [D. Murphy, Z. Zhu, X. Yuan, M. Rosen] The properties at 25°C in aqueous 0.1M NaCl at the aqueous solution/air, aqueous solution/hexadecane, and aqueous solution/hydrophobic solid interfaces of two isomeric Guerbet alcohol-derived surfactants C8H17CH(C6H13)CH2(OC2H4)5SO4Na, one in which the octyl and hexyl groups are both linear (L isomer), the other in which they are both highly branched (B isomer), have been investigated and compared in some cases with commercial sodium linear dodecylbenzene-sulfonate (LAS). The cmc value increases, the pC20 value decreases, and the ΔGo ad value becomes less negative in the order: L isomer—B isomer—LAS. The minimum area/molecule at the aqueous solution/air interface increases in the order: LAS≪L isomer<B isomer. The L isomer is slightly more hydrophobic than the B isomer, and both are considerably more surface-active than LAS. The greater steric inhibition to micellization in the B isomer results in the lowest minimum surface tension. Both isomers have similar minimum interfacial tension values against hexadecane. Unusually small minimum area/molecule values for the two isomers at the aqueous solution/hydrophobic solid interface may indicate multilayer adsorption there. Both isomers are more efficient at reducing the contact angle than LAS. Mixtures of the B isomer with the corresponding unsulfated Guerbet alcohol show only weak interaction between the two. No synergism in surface (or interfacial) tension reduction efficiency or micelle formation exists at either the aqueous solution/air or aqueous solution interface but the mixture does show synergism in surface (or interfacial) tension reduction effectiveness, yielding a surface tension value of 28.2 dynes/cm, and an interfacial tension value of 0.1 dyne/cm against hexadecane. Draves wetting times increase in the order: B isomer<LAS<L isomer, and Ross-Miles initial foam heights decrease in the order B isomer ≈LAS>L isomer. AOCS Press, 1990 Murphy D. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut Zhu Z. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut Yuan X. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut Rosen M. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut Journal of the American Oil Chemists' Society Springer-Verlag 67/4(1990-04-01), 197-204 0003-021X 67:4<197 1990 67 11746 https://doi.org/10.1007/BF02540642 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02540642 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murphy D. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut NATIONALLICENCE 700 1- Zhu Z. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut NATIONALLICENCE 700 1- Yuan X. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut NATIONALLICENCE 700 1- Rosen M. Surfactant Research Institute, Brooklyn College, City University of New York, 11210, Brooklyn, New York aut NATIONALLICENCE 773 0- Journal of the American Oil Chemists' Society Springer-Verlag 67/4(1990-04-01), 197-204 0003-021X 67:4<197 1990 67 11746 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer