A phenomenological one-parameter equation of state for osmotic pressures of PEG and other neutral flexible polymers in good solvents.

A phenomenological one-parameter equation of state for osmotic pressures of PEG and other neutral flexible polymers in good solvents.
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DOI:
10.1021/jp806893a
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发表时间:
2009-03-26
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Parsegian VA
Parsegian VA
中科院分区:
其他
文献类型:
--
作者:
Cohen JA;Podgornik R;Hansen PL;Parsegian VA

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我们提出了一个唯象的单参数标度状态方程,它准确地表示了中性柔性聚合物在良好溶剂中从稀释到半稀释的渗透压。该方程由定标的van‘t Hoff项和Des Cloizeaux项组成,其中包括一个拟合的参数α,即“交叉指数”,它概括了所有的化学特性并确定了相关的前置因素。对于两种截然不同的聚乙二醇水(α)和聚甲基苯乙烯(α)/甲苯(PAMS)体系,其PAM值有明显不同。依赖于α的重新缩放将两个数据集折叠为一个简单的单参数缩放函数。反常的聚乙二醇/水体系和正则体系PAMS/甲苯都可以用相同的状态方程来描述,这证明了de Gennes提出的聚合物标度概念的稳健性。
We present a phenomenological one-parameter scaling equation of state that accurately represents osmotic pressures of neutral flexible polymers in good solvents from the dilute through the semidilute regime. The equation comprises a sum of scaled van’t Hoff and des Cloizeaux terms including a fitted parameter α, the “crossover index”, which encapsulates all chemical specificity and determines the relevant prefactors. Strikingly different values of α are found for the two very different systems poly(ethyleneglycol)/water (PEG) and poly(α-methylstyrene)/toluene (PAMS). α-dependent rescaling collapses both data sets to a simple one-parameter scaling function. The fact that the anomalous system PEG/water and the canonical system PAMS/toluene can both be described by the same equation of state attests to the robustness of the polymer-scaling concepts introduced by de Gennes.
DOI: 10.1016/0375-9601(72)90149-1
发表时间: 1972-01-01
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影响因子: 2.6
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