Cross-Linkable Polyelectrolyte Multilayer Films of Tailored Charge Density
Cross-Linkable Polyelectrolyte Multilayer Films of Tailored Charge Density
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具有定制电荷密度的可交联聚电解质多层膜
DOI：
10.1021/cm903384e
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发表时间：
2010
影响因子：
8.6
通讯作者：
A. Fery
中科院分区：
文献类型：
--
作者：
P. Ott;Patrick;J. Gensel;S. Roesler;K. Trenkenschuh;D. Andreeva;A. Laschewsky;A. Fery
阴离子和阳离子聚电解质的逐层（LbL）沉积技术允许形成具有可调性质和功能性的薄的纳米结构膜。在这里，我们报告的合成和表征的新的阴离子共聚物聚（3-（4-乙烯基苄基硫基）丙烷-1-磺酸钠）-co-聚（2-羟乙基-乙烯基苄基亚砜）与不同的电荷密度（21，36，65，81，和100%）和交联阳离子聚（4-甲基-1-（4-乙烯基苄基）-吡啶氯化物的多层系统。我们研究了盐浓度对不同电荷密度的膜厚度和粗糙度的影响，并讨论了所观察到的趋势方面的电荷效应。此外，我们通过羟醛反应共价交联膜，这保留了带电基团的数量，同时由于偶联产物的特征吸收带而易于通过紫外维斯光谱进行跟踪。交联显著增加了膜的稳定性。因此，新的多层系统允许以定量方式调节离子和共价交联。
The layer-by-layer (LbL) deposition technique of anionic and cationic polyelectrolytes allows formation of thin and ultrathin nanostructured films with tunable properties and, therefore, functionality. Here, we report on the synthesis and characterization of new polyelectrolyte multilayer system consisting of anionic copolymer poly(sodium 3-(4-vinylbenzylsulfanyl)-propane-1-sulfonate)-co-poly(2-hydroxyethyl-vinylbenzyl sulfoxide) with different charge densities (21, 36, 65, 81, and 100%) and cross-linkable cationic poly(4-methyl-1-(4-vinylbenzyl)-pyridinium chloride. We study the impact of salt concentration on film thickness and roughness for the different charge densities and discuss the observed trends with regard to charge effects. Furthermore we covalently cross-link the films by an aldol reaction, which preserves the number of charged groups while being easily followed via UV−vis spectroscopy because of the characteristic absorbance band of the coupling product. Cross-linking increases film stability markedly. Thus the new multilayer system allows tuning of both ionic and covalent cross-linking in a quantitative fashion.