Adsorption of the linear poly(ethyleneimine) precursor poly(2-ethyl-2-oxazoline) and sodium dodecyl sulfate mixtures at the air-water interface: the impact of modification of the poly(ethyleneimine) functionality.

Adsorption of the linear poly(ethyleneimine) precursor poly(2-ethyl-2-oxazoline) and sodium dodecyl sulfate mixtures at the air-water interface: the impact of modification of the poly(ethyleneimine) functionality.
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线性聚(乙烯亚胺)前体聚(2-乙基-2-恶唑啉)和十二烷基硫酸钠混合物在空气-水界面的吸附:聚(乙烯亚胺)官能团改性的影响。

DOI:
10.1021/la303926c
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发表时间:
2012
期刊:
the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Halacheva SS
Halacheva SS
中科院分区:
--
文献类型:
--
作者:
Halacheva SS

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用中子反射率和表面张力研究了聚(2-乙基-2-恶唑啉)-十二烷基硫酸钠聚合物-表面活性剂混合物在空气-水界面上的吸附。观察到的吸附模式更接近于在弱相互作用的聚合物-表面活性剂混合物中遇到的吸附模式,而不是在强相互作用的聚合物-表面活性剂混合物中观察到的显著的吸附增强,例如在相关的聚乙二亚胺-十二烷基硫酸钠混合物中。吸附行为强烈依赖于溶液的pH值、聚合物的相对分子质量和聚合物的浓度。在所研究的较低和较高相对分子质量下,十二烷基硫酸钠对低浓度十二烷基硫酸钠的吸附几乎没有增强作用,而在中等相对分子质量时,则有一定的吸附增强作用。对于较高相对分子质量的聚合物和越来越高的聚合物浓度,对于十二烷基硫酸钠,在临界聚集浓度和临界胶束浓度之间,与纯十二烷基硫酸钠相比,界面上的表面活性剂显著减少。结果表明,聚乙烯亚胺的官能度修饰对表面吸附有重要作用。
The adsorption of the polymer–surfactant mixture of poly(2-ethyl-2-oxazoline)–sodium dodecyl sulfate at the air–water interface has been studied by neutron reflectivity and surface tension. The observed patterns of adsorption more closely resemble those encountered in weakly interacting polymer–surfactant mixtures, rather than the pronounced enhancements in adsorption observed in strongly interacting polymer–surfactant mixtures, such as in the related poly(ethyleneimine)–sodium dodecyl sulfate mixtures. The adsorption was found to be strongly dependent on solution pH, polymer molecular weight, and polymer concentration. At the lower and higher molecular weights studied, there was little enhancement in the sodium dodecyl sulfate adsorption at low sodium dodecyl sulfate concentrations, whereas at the intermediate polymer molecular weights, some enhancement in the adsorption was observed. For the higher-molecular-weight polymers and at increasingly higher polymer concentrations, a significant reduction of the surfactant at the interface compared to pure sodium dodecyl sulfate occurred for sodium dodecyl sulfate concentrations between the critical aggregation concentration and the critical micellar concentration. The results illustrate the important role of modifying the functionality of poly(ethyleneimine) on surface adsorption.
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