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BIBTEX RIS

Interfacial Tension of Aqueous Two-Phase Systems Containing Poly(ethylene glycol) and Potassium Phosphate

2012; American Chemical Society; Volume: 57; Issue: 6 Linguagem: Inglês

10.1021/je1010104

ISSN

1520-5134

Autores

Cássio Carmo de Oliveira, Jane Sélia dos Reis Coimbra, Abraham Damian Giraldo Zuniga, João Paulo Martins, Antônio Marcos de Oliveira Siqueira,

Tópico(s)

biodegradable polymer synthesis and properties

Resumo

The effect of poly(ethylene glycol) (PEG) molar mass, pH, and temperature on interfacial tension was investigated for aqueous two-phase systems composed of PEG with molar masses of (1500, 4000, 6000, and 8000) g·mol–1 and potassium phosphate. The temperatures tested were (293 and 313) K at the pH values of 6, 7, and 9. Interfacial tension was determined by using a spinning drop tensiometer and the Vonnegut equation. An increase in both the PEG molar mass and the temperature resulted in an increase of interfacial tension values. The interfacial tension varied from (0.05 to 3.11) mN·m–1 for systems composed by PEG 4000 (mass fraction; w = 0.12) + potassium phosphate (w = 0.11) + water (w = 0.77) at pH 6.0 and 293 K and PEG 4000 (w = 0.19) + potassium phosphate (w = 0.16) + water (w = 0.65) at pH 7.0 and 313 K, respectively.

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