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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Adsorption of polyampholyte copolymers at the solid/liquid interface: the influence of pH and salt on the adsorption behaviour
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Adsorption of polyampholyte copolymers at the solid/liquid interface: the influence of pH and salt on the adsorption behaviour

机译：固/液界面吸附两性电解质共聚物：pH和盐对吸附行为的影响

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摘要

Polyampholytes are macromolecules that contain oppositely charged groups. We have studied the adsorption of the polyampholyte diblock copolymer poly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate), PMAA-b-PDMAEMA, on oxidized silicon surfaces. The amount of polymer adsorbed from aqueous solution of different pH and salt concentration was measured by ellipsometry. The influence of the added salts NaCl, Na_2SO_4 and CaCl_2 was determined. In every case adsorption took place, although the polyampholyte and the substrate exhibit the same sign of net charge. For all types of salt, the adsorbed amount shows two maxima clos to the isoelectric point (IEP) of the polymer as a function of pH. Directly at the IEP of the polyampholyte, no adsorption was found. The measured dependences can be explained by the adsorption of one or the other of the two blocks depending on acidity and ionic strength. Furthermore, the lateral structure of the dried films was investigated by scanning force microscopy (SFM).
机译：聚两性电解质是含有带相反电荷的基团的大分子。我们已经研究了聚两性电解质二嵌段共聚物聚（甲基丙烯酸）-嵌段-聚（（甲基丙烯酸二甲基氨基）乙酯）PMAA-b-PDMAEMA在氧化硅表面上的吸附。通过椭圆偏振法测量从不同pH和盐浓度的水溶液中吸附的聚合物的量。确定了添加的盐NaCl，Na_2SO_4和CaCl_2的影响。在每种情况下都发生吸附，尽管聚两性电解质和底物表现出相同的净电荷迹象。对于所有类型的盐，其吸附量均显示出两个随聚合物pH值变化的最大等电点（IEP）。直接在聚两性电解质的IEP处未发现吸附。所测得的依赖性可以通过两个嵌段中一个或另一个的吸附取决于酸度和离子强度来解释。此外，通过扫描力显微镜（SFM）研究了干燥膜的横向结构。

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