Radeva Tsetska, Milkova Viktoria, Petkanchin Ivana
Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
J Colloid Interface Sci. 2004 Nov 15;279(2):351-6. doi: 10.1016/j.jcis.2004.06.078.
The formation of stable multilayer films by using as constituents sodium poly(4-styrene sulfonate) (PSS) and poly(4-vinyl pyridine) (PVP) was studied by electrooptics. A strong increase in basicity of the pyridine rings in the electrical field of the oppositely charged PSS chains was suggested to be the driving force for multilayer film formation. A linear increase in the film thickness was registered after deposition of the first three layers, with no dependence on the polyelectrolyte molecular weight. The electrooptical effect was found to increase with increasing area of each next layer, but depended on the molecular weights of both polymers. Polarization of "condensed" counterions along the chains of the last-adsorbed layer was suggested to explain this dependence. Following the counterion dynamics, we come to the conclusion that the electrical properties of the top layer govern the electrooptical behavior of the PSS/PVP film.
通过电光法研究了以聚（4-苯乙烯磺酸钠）（PSS）和聚（4-乙烯基吡啶）（PVP）为成分形成稳定多层膜的过程。据推测，在带相反电荷的PSS链的电场中吡啶环碱性的强烈增加是多层膜形成的驱动力。在前三层沉积后，膜厚度呈线性增加，且与聚电解质分子量无关。发现电光效应随着每一层后续层面积的增加而增强，但取决于两种聚合物的分子量。有人提出，“凝聚”抗衡离子沿最后吸附层的链的极化可以解释这种依赖性。根据抗衡离子动力学，我们得出结论，顶层的电学性质决定了PSS/PVP膜的电光行为。
