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Two Critical Aggregation Concentrations in Interaction of Poly(diallyldimethylammonium chloride) with Anionic Surfactant Sodium Dodecyl Sulfate  

김용철 (금오공과대학교 고분자공학과)
박일현 (금오공과대학교 고분자공학과)
양경모 (금오공과대학교 고분자공학과)
조동환 (금오공과대학교 고분자공학과)
Publication Information
Polymer(Korea) / v.28, no.2, 2004 , pp. 111-120 More about this Journal
Abstract
The interaction between poly(diallyldimethylammonium chloride) (PDADMAC) of positive charge per repeating unit and anionic surfactant, sodium dodecyl sulfate (SDS) has been investigated by light scattering, turbidimetry and fluorescence. Chain behavior of PDADMAC in 0.3 M NaCl aqueous solution seems like neutral polymer chain In good solvent. By adding SDS into PDADMAC solution, strong attractive interaction develops between them, and can be described with two kinds of critical aggregation concentration(CAC). First, at [SDS]/]DADMAC] 0.06, intramolecular critical micellization of SDS occurs inside a single polymer chain. The maximum size of SDS-polymer complex is observed just before intramolecular CAC. Above intramolecular CAC, the size of this complex starts to shrink slowly due to involvement of polymer subchain in micelle. Second, intermolecular CAC is also observed at [SDS]/[DADMAC] 0.5 by means of turbidimetry. Strong aggregation of polymer chains decorated with many micelles occurs after the second CAC, and huge aggregates have formed.
Keywords
poly(diallyldimethylammonium chloride); sodium dodecyl sulfate; critical aggregation con centration; light scattering; fluorescence;
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