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首页> 外文期刊>Polymers for advanced technologies >Polymethylmethacrylate derivatives EudragitE100andL100: Interactions and complexation with surfactants
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Polymethylmethacrylate derivatives EudragitE100andL100: Interactions and complexation with surfactants

机译：聚甲基甲基丙烯酸酯衍生物Eudragite100and100：相互作用和络合与表面活性剂

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Precipitation or coprecipitation of polyelectrolytes has been largely investigated. However, the precipitation of polyelectrolytes via addition of charged and non-charged surfactants has not been systematically studied and reported. Consequently, the aim of this work is to investigate the effect of different surfactants (anionic, cationic, non-charged and zwitterionic) on the precipitation of cationic and anionic polymethylmethacrylate polymers (Eudragit). The surfactants effect has been investigated as a function of their concentration. Special attention has been dedicated to the CMC range and to the colloidal characterization of the formed dispersions. Moreover, the effect of salt (NaCl) and pH was also addressed. It is pointed out that non-ionic and zwitterionic surfactants do not interact with charged Eudragit E100 and L100. For oppositely charged Eudragit E100/SDS and Eudragit L100/CTAB, precipitation occurs, and the obtained dispersions have been characterized in terms of particle size distribution and zeta potential. It was established that the binding of SDS molecules to Eudragit E100 polymer chains is made through the negative charges of the surfactant heads under the CMC value whereas binding of CTAB to Eudragit L100 chains is made at a CTAB concentration 5 times above its CMC. For Eudragit E100/SDS system, a more acidic medium induces aggregation. A same result was observed for the Eudragit L100/CTAB at a more basic pH. Moreover, it was observed that increasing salt concentration (higher than 100 mM) led to aggregation as generally observed for polycations/anionic surfactant systems.
机译：聚电解质的沉淀或共沉淀已被大量研究。然而，通过添加带电荷和不带电荷的表面活性剂来沉淀聚电解质的方法尚未得到系统的研究和报道。因此，本工作的目的是研究不同表面活性剂（阴离子、阳离子、非荷电和两性离子）对阳离子和阴离子聚甲基丙烯酸甲酯聚合物（Eudragit）沉淀的影响。研究了表面活性剂效应随浓度的变化。特别关注CMC范围和形成的分散体的胶体特性。此外，还讨论了盐（NaCl）和pH值的影响。指出非离子表面活性剂和两性离子表面活性剂不与带电的Eudragit E100和L100相互作用。对于带相反电荷的Eudragit E100/SDS和Eudragit L100/CTAB，会发生沉淀，并根据粒径分布和zeta电位对获得的分散体进行了表征。SDS分子与Eudragit E100聚合物链的结合是通过表面活性剂头部的负电荷在CMC值以下实现的，而CTAB与Eudragit L100链的结合是在CTAB浓度高于其CMC 5倍时实现的。对于Eudragit E100/SDS系统，酸性更强的介质会诱导聚集。在更碱性的pH下，Eudragit L100/CTAB也观察到了相同的结果。此外，观察到，盐浓度增加（高于100 mM）会导致聚阳离子/阴离子表面活性剂系统中普遍观察到的聚集。

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