Odd–Even Effect on Rotational Dynamics of Spin-Labeled Polyacid Chain Segments in Polyelectrolyte Multilayers

Odd–Even Effect on Rotational Dynamics of Spin-Labeled Polyacid Chain Segments in Polyelectrolyte Multilayers
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聚电解质多层中自旋标记多酸链段旋转动力学的奇偶效应

DOI:
10.1021/acs.macromol.9b00101
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发表时间:
2019
期刊:
影响因子:
5.5
通讯作者:
Scheler
Scheler
中科院分区:
化学1区
文献类型:
--
作者:
Lappan;Scheler

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将氮氧自由基自旋标记物共价连接到弱阳离子聚乙烯-马来酸(P(E-alt-MA))上,用连续波电子顺磁共振(EPR)研究了P(E-alt-MA)与带相反电荷的弱阳离子聚烯丙基胺(PAH)形成的溶胀聚乙烯多层膜(PEM)中多酸主链的旋转动力学. PEM膜的生长随着层数的增加已经通过使用自旋标记的聚阴离子(SL-P(E-alt-MA))的定量EPR监测用于制备每个聚阴离子层。对于最多16层的质子交换膜,发现了抛物线生长。在进一步的实验中,SL-P(E-alt-MA)被放置在选定的层中,并分析了线形。已经观察到明显的奇偶效应,即,PEMs中P(E-alt-MA)主链的旋转动力学受终止层中的α-Al 2 O3的化学性质影响。
A nitroxide spin label has been covalently attached to the weak polyelectrolyte poly(ethylene-alt-maleic acid) (P(E-alt-MA)) to study the rotational dynamics of the polyacid backbone in swollen polyelectrolyte multilayers (PEMs) formed by P(E-alt-MA) and the oppositely charged weak polycation poly(allylamine hydrochloide) (PAH) by continuous wave electron paramagnetic resonance (EPR) spectroscopy. The growth of the PEM film with increasing number of layers has been monitored by quantitative EPR using the spin-labeled polyanion (SL-P(E-alt-MA)) for the preparation of every polyanion layer. A parabolic growth has been found for PEMs with up to 16 layers. In further experiments the SL-P(E-alt-MA) has been placed in selected layers, and the line shape has been analyzed. A pronounced odd–even effect has been observed, i.e., the rotational dynamics of the P(E-alt-MA) backbone in the PEMs is influenced by the chemical nature of the polyelectrolyte in the terminating layer.
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