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首页> 外文期刊>Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena >The dielectric increments of aqueous polyelectrolyte solutions: a scaling approach
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The dielectric increments of aqueous polyelectrolyte solutions: a scaling approach

机译：聚电解质水溶液的介电增量：缩放方法

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This paper deals with dielectric dispersion curves (covering a frequency range from a few Hz to 100 MHz) of Na - poly(styrene-sulfonate) of 65 000 less than or equal to M-w less than or equal to 1 060 000 g mol(-1) in aqueous solutions. The values of the row frequency (Delta is an element of(1)) and high frequency (Delta is an element of(2)) dielectric increments, obtained from the experimental curves matched to a superposition of two Cole-Cole equations, have been analyzed in terms of their concentration and molar mass dependence. The concentrations C (g l(-1)) of the various solutions were mostly situated in the transition regime defined by Odijk [T. Odijk, Macromolecules 12 (1979) 688] between the dilute regime (C < C-g*) and the semi-dilute one (C > C**), and wherein the characteristic concentration C* marks the onset of flexibility effects on the polyion behavior. It has been shown that in the concentration range C-g* < C < C** the increments in both frequency domains satisfy a scaring relation Delta is an element of(j) = B-j M-vj (C/C*)(mu j) with molar mass independent exponents v(j) and mu(j) changing around C*. Their values are different for Delta is an element of(1) and Delta is an element of(2), except for mu above C* where both increments appear to become concentration-independent. Below C-g*, in the dilute regime, the two dispersion domains seem to merge. The increment Delta is an element of = is an element of' (0) - is an element of (infinity) is molar mass independent if scaled to (C/C-g*). The molar mass dependence of the increments as a function of the macromolecular concentration rho(P), Delta is an element of or Delta is an element of(j) similar to M-gamma (rho(P))(mu), also reveals differences between the different concentration regimes. Extrapolation from above C-g* to zero concentration is thus unjustified. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 33]
机译：本文处理的Na-聚苯乙烯磺酸钠小于或等于Mw小于或等于1,060 000 g mol（-）的介电弥散曲线（涵盖从几Hz到100 MHz的频率范围） 1）在水溶液中。从与两个Cole-Cole方程的叠加相匹配的实验曲线中获得的行频（Delta是（1）的元素）和高频（Delta是（2）的元素）的值，已经得到对其浓度和摩尔质量依赖性进行分析。各种溶液的浓度C（g l（-1））大部分位于Odijk [T. Odijk，Macromolecules 12（1979）688]在稀溶液（C C **）之间，其中特征浓度C *表示柔韧性作用开始于聚离子行为。 。已经表明，在浓度范围Cg *

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