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The Use of Polymer and Surfactants for the Microencapsulation and Emulsion Stabilization

机译：聚合物和表面活性剂在微囊化和乳液稳定中的应用

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摘要

Polymer/surfactant mixtures have a wide range of industrial and technological applications, one of them being the use in microencapsulation and emulsion stabilization processes. These mixtures are able to form adsorption layers at the surface of oil droplets and so affect the emulsion stability, which depends on the polyelectrolyte/surfactant nature, concentrations ratio, method of the emulsification, etc. Polyelectrolytes alone show low surface activity in contrast to surfactants, which adsorb at the water/oil interface, making the droplets charged, but they are insufficient to stabilize emulsions. When an oppositely-charged polymer is added to the surfactant solution, a steric barrier is formed, which prevents coalescence and enhances the stability. The present review is devoted to the recent studies of the use of polymer/surfactant mixtures for the encapsulation of active ingredients and stabilization of single and double emulsions. Active ingredients are added to the oil phase prior to emulsification so that any subsequent dissolution of the core, like in other encapsulation protocols, can be omitted. By measuring the interfacial tension and dilational rheology it is possible to find optimum conditions for the emulsion formation and hence for encapsulation. Therefore, such systems have become a prominent approach for the encapsulation of active ingredients.
机译：聚合物/表面活性剂混合物具有广泛的工业和技术应用，其中之一是用于微囊化和乳液稳定过程。这些混合物能够在油滴的表面形成吸附层，从而影响乳液的稳定性，这取决于聚电解质/表面活性剂的性质，浓度比，乳化方法等。与表面活性剂相比，聚电解质本身的表面活性较低，它们吸附在水/油界面，使液滴带电，但它们不足以稳定乳液。当将带相反电荷的聚合物添加到表面活性剂溶液中时，形成了空间阻挡层，其防止了聚结并增强了稳定性。本综述致力于聚合物/表面活性剂混合物用于活性成分的封装以及单和双乳液稳定化的最新研究。在乳化之前，将活性成分添加到油相中，这样就可以像在其他封装方案中一样，避免随后的核溶解。通过测量界面张力和膨胀流变性，可以找到用于乳液形成并因此用于封装的最佳条件。因此，这样的系统已经成为封装活性成分的重要方法。

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