Polyelectrolyte Multilayers Studied by Electron Paramagnetic Resonance (EPR) Spin-Label Technique
Polyelectrolyte Multilayers Studied by Electron Paramagnetic Resonance (EPR) Spin-Label Technique
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通过电子顺磁共振 (EPR) 自旋标签技术研究聚电解质多层
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
U. Scheler
中科院分区：
文献类型：
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作者：
U. Lappan;Brigitte Wiesner;S. Zschoche;U. Scheler
用电子顺磁共振(EPR)谱研究了聚电解质聚(乙烯-丙基-马来酸)(P(E-ALT-MA))上的氮氧化物自旋标记，研究了这一弱聚阴离子、带相反电荷的强阳离子聚(二烯丙基二甲基氯化铵)(PDADMAC)与溶胀聚电解质多层膜(PEM)中水的相互作用。如果用自旋标记的聚阴离子制备每一层膜，则可以用定量的EPR来监测PEM膜的生长。另一方面，如果自旋标记的聚阴离子已经被选择性地放置在PEM膜中的不同层中，则可以研究诸如溶胀介质的pH等环境对位于所选择的层中的聚电解质分子的迁移率的影响。
A nitroxide spin label has been covalently attached to the polyelectrolyte poly(ethylene-alt-maleic acid) (P(E-alt-MA)) to study the interaction between this weak polyanion, the oppositely charged strong polycation poly(diallyldimethylammonium chloride) (PDADMAC) and water in swollen polyelectrolyte multilayers (PEM) by electron paramagnetic resonance (EPR) spectroscopy. If the spin-labeled polyanion has been used for the preparation of every double layer, the growth of the PEM film can be monitored by quantitative EPR. On the other hand, if the spin-labeled polyanion has been selectively placed in different layers in the PEM film the influence of the environment such as pH of the swelling medium of the mobility of the polyelectrolyte molecules positioned in the selected layer can be investigated.