Abstract The interactions between a polyelectrolyte and an oppositely charged surfactant allows obtaining complexes with specific properties. Such complexes between a quaternized chitosan, obtained from the reaction between chitosan and quaternary ammonium epoxides, and sodium 1-decanesulfonate were studied. Physico-chemical characteristics were obtained from conductimetric experiments as well as surface tension studies. A strong associative electrostatic interaction between the polysaccharide and the surfactant was shown from conductimetric experiments and a degree of association equal to 0.74 was determined. The complex presents better interfacial properties than surfactant and polysaccharide alone. The critical aggregation concentration is much smaller than the critical micellar concentration of the surfactant alone in solution. Moreover the viscoelastic moduli of the interfacial layer was increased in presence of the complex by comparing with surfactant alone. All these considerations allow using the surfactant-polysaccharide complex as a better emulsion stabilizer than either surfactant or polysaccharide alone.

中文翻译：

---

基于季铵化壳聚糖的表面活性剂-多糖复合物。乳液稳定性的表征和应用

摘要 聚电解质和带相反电荷的表面活性剂之间的相互作用允许获得具有特定性质的复合物。研究了由壳聚糖和季铵环氧化物反应得到的季铵化壳聚糖和 1-癸烷磺酸钠之间的这种复合物。从电导实验以及表面张力研究中获得物理化学特性。电导实验表明多糖和表面活性剂之间存在强缔合静电相互作用，并且确定了等于 0.74 的缔合度。该复合物比单独的表面活性剂和多糖表现出更好的界面特性。临界聚集浓度远小于溶液中单独的表面活性剂的临界胶束浓度。此外，与单独的表面活性剂相比，在复合物存在下界面层的粘弹性模量增加。所有这些考虑允许使用表面活性剂-多糖复合物作为比单独的表面活性剂或多糖更好的乳液稳定剂。