Investigation on the Interaction between Sodium Dodecyl Sulfate and Cationic Polymer by Dynamic Light Scattering, Rheological, and Conductivity Measurements
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- 作者：Lingjie Kong ; Ming Cao ; Mingtan Hai
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2007
- 出版时间：May 2007
- 年：2007
- 卷：52
- 期：3
- 页码：721 - 726
- 全文大小：78K
- 年卷期：v.52,no.3(May 2007)
- ISSN：1520-5134
文摘
The interaction between sodium dodecyl sulfate (SDS) and the cationic polymer poly(diallyldimethylammoniumchloride) (PDAC) was investigated by viscosity, conductivity, and dynamic light scattering measurements at 298K in order to monitor the changes in the charged nature and size of SDS + PDAC complexes. The experimentalresults showed that the critical aggregation concentration (CAC) value of SDS + 1 % mass fraction PDAC isalmost 2 orders of magnitude lower than the critical micelle concentration of SDS. The viscosity of the SDS +PDAC solution increased with decreasing shear rate, exhibiting non-Newtonian behavior. The minimum viscosityand hydrodynamic diameter of SDS + PDAC complexes at the binding site confirmed the contraction of thepolymer chain and the formation of a more compact structure. When the SDS concentration was above the CAC,the viscosity and hydrodynamic diameter increased, indicating that the PDAC chains first extended and finallycollapsed and precipitated. The binding degree of SDS + 1 % mass fraction PDAC was from 
< 1 to 
1.The interaction between SDS and PDAC can be divided into different characteristic SDS concentration ranges.At low SDS concentration, the surfactant-polymer system is a thermodynamically stable solution of the surfactant+ polymer complex molecules. Above this critical concentration, the system is an unstable colloid dispersion ofSDS + PDAC complex particles. The interaction between SDS and PDAC is favored and strong.
< 1 to 1.The interaction between SDS and PDAC can be divided into different characteristic SDS concentration ranges.At low SDS concentration, the surfactant-polymer system is a thermodynamically stable solution of the surfactant+ polymer complex molecules. Above this critical concentration, the system is an unstable colloid dispersion ofSDS + PDAC complex particles. The interaction between SDS and PDAC is favored and strong.