Comparison of temperature effects on the salting out of poly(ethylene glycol) versus poly(ethylene oxide)−poly(propylene oxide) random copolymer / Meghna Dilip in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2371–2379 Titre : Comparison of temperature effects on the salting out of poly(ethylene glycol) versus poly(ethylene oxide)−poly(propylene oxide) random copolymer Type de document : texte imprimé Auteurs : Meghna Dilip, Auteur ; Scott T. Griffin, Auteur ; Scott K. Spear, Auteur Année de publication : 2010 Article en page(s) : pp. 2371–2379 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Random Copolymer  Poly(ethylene glycol)  oxide)  Poly(propylene Aqueous biphasic systems Résumé : In common with many poly(ethylene glycol)s (PEGs), a poly(ethylene oxide)−poly(propylene oxide) random copolymer (EO−PO, with EO/PO = 1:1.3) of molecular weight 3320 g·mol−1, known as Sunbright-3320 (SB-3320), can be salted out of aqueous solution using kosmotropic salts such as (NH4)2SO4 to form aqueous biphasic systems (ABSs) comprising upper polymer-rich and lower salt-rich aqueous phases. The effects of temperature on these liquid/liquid ABSs and related solid/liquid resin-based systems, where one end of the polymer has been covalently attached to a solid support, have been studied. Distribution ratios of NH499TcO4 were determined radiometrically at various polymer and salt concentrations and temperatures. SB-3320-grafted poly(styrene) resins exhibit opposite effects of variable-temperature partitioning compared to the SB-3320-based ABS. However, the results are complicated because of the conformational changes that are possible for the SB-3320 polymer. Enthalpy and entropy changes were found to be temperature-dependent. The differences observed between the distribution of 99TcO4− in EO−PO-based systems versus PEG-based systems can be attributed to the lower cloud point temperatures and probable conformational changes for the EO−PO systems. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901268m [article] Comparison of temperature effects on the salting out of poly(ethylene glycol) versus poly(ethylene oxide)−poly(propylene oxide) random copolymer [texte imprimé] / Meghna Dilip, Auteur ; Scott T. Griffin, Auteur ; Scott K. Spear, Auteur . - 2010 . - pp. 2371–2379. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2371–2379 Mots-clés : Random Copolymer  Poly(ethylene glycol)  oxide)  Poly(propylene Aqueous biphasic systems Résumé : In common with many poly(ethylene glycol)s (PEGs), a poly(ethylene oxide)−poly(propylene oxide) random copolymer (EO−PO, with EO/PO = 1:1.3) of molecular weight 3320 g·mol−1, known as Sunbright-3320 (SB-3320), can be salted out of aqueous solution using kosmotropic salts such as (NH4)2SO4 to form aqueous biphasic systems (ABSs) comprising upper polymer-rich and lower salt-rich aqueous phases. The effects of temperature on these liquid/liquid ABSs and related solid/liquid resin-based systems, where one end of the polymer has been covalently attached to a solid support, have been studied. Distribution ratios of NH499TcO4 were determined radiometrically at various polymer and salt concentrations and temperatures. SB-3320-grafted poly(styrene) resins exhibit opposite effects of variable-temperature partitioning compared to the SB-3320-based ABS. However, the results are complicated because of the conformational changes that are possible for the SB-3320 polymer. Enthalpy and entropy changes were found to be temperature-dependent. The differences observed between the distribution of 99TcO4− in EO−PO-based systems versus PEG-based systems can be attributed to the lower cloud point temperatures and probable conformational changes for the EO−PO systems. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901268m

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Dual nature of polyethylene glycol-based aqueous biphasic extraction chromatographic (ABEC) resins / Meghna Dilip in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7390–7396 Titre : Dual nature of polyethylene glycol-based aqueous biphasic extraction chromatographic (ABEC) resins : uptakes of perchlorate versus mercury(II) Type de document : texte imprimé Auteurs : Meghna Dilip, Auteur ; Scott T. Griffin, Auteur ; Scott K. Spear, Auteur Année de publication : 2008 Article en page(s) : p. 7390–7396 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Polyethylene glycol ABEC resins Mercury(II) cations Perchlorate anions Résumé : Polyethylene glycol (PEG)-grafted aqueous biphasic extraction chromatographic (ABEC) resins have been shown to remove both mercury(II) cations (Hg2+) or perchlorate anions (ClO4−) from aqueous media under different conditions. Water destructuring (chaotropic) anions such as perchlorate (ΔGhyd = −214 kJ/mol) partitioned to ABEC resin in the presence of water structuring (kosmotropic) anions, with increased affinity for the resin as the kosmotropic nature of the anion increased (Cl− En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800841j [article] Dual nature of polyethylene glycol-based aqueous biphasic extraction chromatographic (ABEC) resins : uptakes of perchlorate versus mercury(II) [texte imprimé] / Meghna Dilip, Auteur ; Scott T. Griffin, Auteur ; Scott K. Spear, Auteur . - 2008 . - p. 7390–7396. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7390–7396 Mots-clés : Polyethylene glycol ABEC resins Mercury(II) cations Perchlorate anions Résumé : Polyethylene glycol (PEG)-grafted aqueous biphasic extraction chromatographic (ABEC) resins have been shown to remove both mercury(II) cations (Hg2+) or perchlorate anions (ClO4−) from aqueous media under different conditions. Water destructuring (chaotropic) anions such as perchlorate (ΔGhyd = −214 kJ/mol) partitioned to ABEC resin in the presence of water structuring (kosmotropic) anions, with increased affinity for the resin as the kosmotropic nature of the anion increased (Cl− En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800841j

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