Journal
POLYMER
Volume 46, Issue 8, Pages 2567-2572Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2005.02.019
Keywords
Hofmeister series; phase separation; poly(ethylene glycol)
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The compositions of coexisting phases have been determined for aqueous two-phase systems containing poly(ethylene glycol) (PEG) of nominal molecular weight 8000 and a series of eight electrolytes: NaOH, Na2CO3, Na2SO4, Na2HPO4, Na3PO4, (NH4)(2)SO4, MgSO4, ZnSO4. The salting-out effects of the electrolytes on the polymer were obtained by fitting a Setschenow-type equation to the tie line data to derive a salting-out coefficient for each electrolyte. For the sodium salts the relative effectiveness of the anions in forming biphasic mixtures follows the Hofmeister series. The relative salting-out effectiveness of the sulphate salts, however, is probably influenced by complexation of the cations by PEG. The values of the salting-out coefficients reflect the extent of preferential hydration of the ethylene oxide units in the polymer chains. (c) 2005 Elsevier Ltd. All rights reserved.
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