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Per Lyngs Hansen

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

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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 alpha, the "crossover index", which encapsulates all chemical specificity and determines the relevant prefactors. Strikingly different values of alpha are found for the two very different systems poly(ethyleneglycol)/water (PEG) and poly(alpha-methylstyrene)/toluene (PAMS). Alpha-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.
Original languageEnglish
JournalJournal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
Pages (from-to)3709-3714
Number of pages6
Publication statusPublished - 26 Mar 2009
Externally publishedYes

    Research areas

  • Osmotic Pressure, Polyethylene Glycols, Solvents, Styrenes, Toluene, Water

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