Branched Poly(ethylenimine) as Barrier Layer for Polyelectrolyte Diffusion in Multilayer Films
Branched Poly(ethylenimine) as Barrier Layer for Polyelectrolyte Diffusion in Multilayer Films
复制标题
支化聚氮丙啶作为多层膜中聚电解质扩散的阻挡层
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Helm
中科院分区：
文献类型：
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作者：
P. Nestler;M. Paßvogel;H. Ahrens;O. Soltwedel;Ralf Köhler;C. Helm
通过对聚阴离子和聚阳离子在0.1mol/LNaCl溶液中的顺序吸附，制备了线性组装聚阴离子多层膜（PEMs）。用中子反射率研究了质子交换膜的内部结构。该膜由聚（乙烯亚胺）（PEI）、聚（二烯丙基二甲基铵）（PDADMA）和聚（苯乙烯磺酸盐）（PSS或氘代PSS-d）制成。每个膜由质子化和氘代块组成，分别由m个质子化和n个氘代聚阳离子/聚阴离子层对构建。在盐溶液（1 mol/L NaCl）中退火允许聚电解质通过采用更卷曲的构象和通过混合来获得熵。在退火过程中，由于相互扩散，两个块之间的内部界面变宽;因此，测量PSS扩散系数。最终，退火导致质子化和氘代PSS在整个膜中均匀分布。然而，如果膜中心的一个聚阳离子层是支化PEI，则该PEI层充当扩散阻挡层。
Linearly assembled polyelectrolyte multilayers (PEMs) are prepared by sequential adsorption of polyanions and polycations from 0.1 mol/L NaCl. The internal structure of PEMs is investigated with neutron reflectivity. The films are made from poly(ethylenimine) (PEI), poly(diallyldimethylammonium) (PDADMA) and poly(styrenesulfonate) (PSS or deuterated PSS-d). Each film consists of a protonated and a deuterated block, built from m protonated and n deuterated polycation/polyanion layer pairs, respectively. Annealing in salt solution (1 mol/L NaCl) allows the polyelectrolytes to gain entropy by adopting a more coiled conformation and by intermixing. During annealing the internal interface between the two blocks broadens due to interdiffusion; thus, the PSS diffusion coefficient is measured. Eventually the annealing leads to a uniform distribution of protonated and deuterated PSS throughout the film. Yet, if one polycation layer in the film center is branched PEI, then this PEI layer serves as a diffusion barri...
影响因子：
7.015
作者：
Xu L;Kozlovskaya V;Kharlampieva E;Ankner JF;Sukhishvili SA
通讯作者：
Sukhishvili SA