Oppositely charged polyelectrolytes grafted onto planar surface: Mean-field lattice theory
Oppositely charged polyelectrolytes grafted onto planar surface: Mean-field lattice theory
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DOI：
10.1007/s101890170016
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发表时间：
2001-10
期刊：
影响因子：
--
通讯作者：
N. Shusharina;P. Linse
中科院分区：
文献类型：
--
作者：
N. Shusharina;P. Linse
用平均场晶格理论研究了由带相反符号电荷的接枝链形成的平面刷的平衡结构。两个不同的架构刷被认为是：一个形成的接枝二嵌段共聚物与带相反电荷的嵌段和其他是一个混合刷组成的带相反电荷的均聚物。该系统显示出非平凡的本质上不均匀的刷状结构起源于链的连接性和段之间的静电相互作用。此外，观察到刷内拉伸和卷曲链的共存。讨论了块的电荷、带相反电荷的块的相对长度以及溶液的离子强度对刷的不均匀性和两种类型的刷之间的结构差异的影响。
Equilibrium structures of planar polyelectrolyte brushes formed by grafted chains carrying charges of opposite sign are examined by employing mean-field lattice theory. Two brushes of different architecture are considered: one formed by grafted diblock copolymers with oppositely charged blocks and the other being a mixed brush composed of oppositely charged homopolymers. The systems display nontrivial intrinsically inhomogeneous brush structures originating from the chain connectivity and the electrostatic interaction among the segments. In addition, a coexistence of stretched and coiled chains inside the brush is observed. The influence of the charges of the blocks, the relative length of the oppositely charged blocks, and the ionic strength of the solution on the brush inhomogeneity and structural differences between the two types of brushes are discussed.