Self-Consistent Field Theory Study of the Effect of Grafting Density on the Height of a Weak Polyelectrolyte Brush

被引:53
作者
Witte, Kevin N. [1 ]
Kim, Sangtae [1 ]
Won, You-Yeon [1 ]
机构
[1] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA
基金
美国国家科学基金会;
关键词
POLY(ACRYLIC ACID) BRUSHES; NEUTRAL POLYMER BRUSHES; MIXED POLYELECTROLYTE; DIBLOCK COPOLYMERS; SURFACE MICELLE; BEHAVIOR; STABILIZATION; INTERFACE; GRADIENTS; SALT;
D O I
10.1021/jp809814j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The height of weakly basic polyelectrolyte brushes in the osmotic brush regime is studied as a function of the grafting density using a numerical self-consistent field theory derived front the (semi)grand canonical partition function. The theory is shown to properly account for the local nature of the charge equilibrium and to capture the basic behaviors of polyelectrolyte brushes. On one hand, we find, in agreement with recent experiments, that the scaling of brush height with grafting density can be qualitatively different at intermediate chain lengths than that predicted by basic scaling arguments. This difference is attributed to the relative strength of electrostatic type interactions compared to finite segment size packing constraints. On the other hand, the trend of decreasing brush height with increasing grafting density predicted by the classic scaling analysis is recovered for large molecular weight polymers immersed in a solution of very weak ionic strength.
引用
收藏
页码:11076 / 11084
页数:9
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