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KMID : 1024519940030010057
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Journal of the Environmental Sciences
1994 Volume.3 No. 1 p.57 ~ p.64
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Hydrophilic and Hydrophobic Group Characteristics for Nonionic Surfactants
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Ha Youn-Shick
Son Man-Sik
Paek U-Hyon
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Abstract
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On the basis of the principle of Bratch’s electronegativity equalization, we calculated group partial charges and group electronegativities for nonionic surfactants with Pauling’s elecoonegativity parameters by using numerical calculation method. From calculated outputs we have investigated structural stability of micelle, characteristics of hydrophilic and hydrophobic groups, and relation between CMC(Critical Micelle Concentraion) and group partial charge and group electronegativity of hydrophilic and hydrophobic groups for nonionic surfactants. We have known that CMC by micelle formation depends upon group partial charge and group electronegativity of hydrophilic and hydrophobic groups for surfactants. Also, the structural stability of micelle in H2O solution is related to the electric double layer by the hydrophilic group of nonionic surfactants with H atoms in water CMC is diminished by the decrease of repeating units in hydrophilic group at constant hydrophobic group and is diminished by the increments of alkyl chains in hydrophobic group at constant hydrophilic group for nonionic surfactants. In conclusion, CMC is diminished because there is no electrostatic repulsion and is diminished of Debye length by the increments of partial charge of hydrophobic group. Key Words : principle of Bratch’s electronegativity equalization, group partial charges, group electronegativities, Pauling’s electronegativity parameter, numerical calculation method, hydrophilic and hydrophobic grouts, CMC, nonionic surfactants, Debye length
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KEYWORD
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principle of Bratchs electronrgativity equalization, group partial charges, group electronegativities, Paulings electronegativity parameter, numerical caculation method, hydrophilic and hydrophobic groups, CMC, nonionic surfactants, Debye length
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