Department of Polymer, Faculty of Chemistry, University of Concepcion, Concepcion, Chile.
J Colloid Interface Sci. 2011 Nov 15;363(2):682-9. doi: 10.1016/j.jcis.2011.05.089. Epub 2011 Aug 4.
Metal-ion retention properties of water-soluble amphiphilic polymers in presence of double emulsion were studied by diafiltration. Double emulsion systems, water-in-oil-in-water, with a pH gradient between external and internal aqueous phases were prepared. A poly(styrene-co-maleic anhydride) (PSAM) solution at pH 6.0 was added to the external aqueous phase of double emulsion and by application of pressure a divalent metal-ion stream was continuously added. Metal-ions used were Cu(2+) and Cd(2+) at the same pH of polymer solution. According to our results, metal-ion retention is mainly the result of polymer-metal interaction. Interaction between PSMA and reverse emulsion globules is strongly controlled by amount of metal-ions added in the external aqueous phase. In addition, as metal-ion concentration was increased, a negative effect on polymer retention capacity and promotion of flocculation phenomena were produced.
采用渗滤法研究了双乳液中水溶性两亲聚合物对金属离子的保留特性。制备了 pH 值在内外水相之间存在梯度的油包水包水（W/O/W）型双乳液体系。将 pH 值为 6.0 的聚（苯乙烯-co-马来酸酐）（PSAM）溶液加入到双乳液的外水相，通过施加压力，连续加入二价金属离子流。所用的金属离子为 Cu(2+)和 Cd(2+)，与聚合物溶液的 pH 值相同。根据我们的结果，金属离子的保留主要是聚合物-金属相互作用的结果。PSMA 与反相乳液液滴之间的相互作用主要受外加于外水相的金属离子数量的控制。此外，随着金属离子浓度的增加，聚合物的保留能力受到负面影响，并促进了絮凝聚现象的产生。
