Radeva T, Petkanchin I
Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
J Colloid Interface Sci. 1999 Dec 1;220(1):112-117. doi: 10.1006/jcis.1999.6483.
The influence of molecular weight on the counterion polarization of sodium polystyrenesulfonate (NaPSS) is investigated by electric light scattering. The polyelectrolyte is adsorbed in excess on beta-ferric hydrous oxide particles (beta-FeOOH), which are shown to assume the charge characteristics of the polymer. Two dispersion regions of the electro-optical effect (below and above 10 kHz) are found to exist due to the polarization of counterions. The high-frequency (HF) effect is attributed to polarization of free counterions along the polymer-coated particle axis and does not depend on the molecular weight of the adsorbed polymer. The amplitude and critical frequency of relaxation of the low-frequency (LF) effect, which is attributed to polarization of bound counterions along the polymer axis, depend on the polyelectrolyte molecular weight. The polarization of bound counterions seems to be responsible for the permanent-like dipole moment behavior of NaPSS at low frequencies of the applied electric field. Copyright 1999 Academic Press.
通过电光散射研究了分子量对聚苯乙烯磺酸钠（NaPSS）反离子极化的影响。聚电解质过量吸附在β-氢氧化铁颗粒（β-FeOOH）上，这些颗粒呈现出聚合物的电荷特性。由于反离子的极化，发现存在两个电光效应的色散区域（低于和高于10 kHz）。高频（HF）效应归因于游离反离子沿聚合物包覆颗粒轴的极化，并且不依赖于吸附聚合物的分子量。低频（LF）效应的弛豫幅度和临界频率归因于结合反离子沿聚合物轴的极化，取决于聚电解质的分子量。结合反离子的极化似乎是导致NaPSS在施加电场低频下呈现类永久偶极矩行为的原因。版权所有1999年学术出版社。
