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|Type:||Artigo de periódico|
|Title:||Thermodynamics Of The Partitioning Of Poly(propylene Oxide) Between Aqueous And Chlorinated Organic Phases Compared To Poly(ethylene Oxide) And Other Hydrophilic Polymers|
|Abstract:||Thermodynamic functions associated with the partitioning of poly(propylene oxide), PPO, between aqueous and organic (chloroform, dichloromethane, and chlorobenzene) phases were determined and analyzed in comparison with those for the partitioning of poly(ethylene oxide), PEO, and poly (vinyl pyrrolidone), PVP. Amounts of water accompanying the partitioning of PPO to the organic phases were also measured. These results reveal that PPO partitioning is controlled by hydrophobic effects (entropie contribution), which was confirmed by the release of a significant amount of water molecules following the partitioning. Hydrophilic polymers like PVP and polyacrylamide, on the other hand, remain almost quantitatively in the aqueous phase. PEO remains a unique example of a polymer displaying high affinity for water, but that can be extracted to certain organic solvents (which should display hydrogen bond donating capacity). Copyright © 2006 John Wiley & Sons, Ltd.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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