Publicação: Water activity of aqueous solutions of ethylene oxide-propylene oxide block copolymers and maltodextrins
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Brazilian Society of Chemical Engineering
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Artigo
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Acesso aberto
Resumo
The water activity of aqueous solutions of EO-PO block copolymers of six different molar masses and EO/PO ratios and of maltodextrins of three different molar masses was determined at 298.15 K. The results showed that these aqueous solutions present a negative deviation from Raoult's law. The Flory-Huggins and UNIFAC excess Gibbs energy models were employed to model the experimental data. While a good agreement was obtained with the Flory-Huggins equation, discrepancies were observed when predicting the experimental behavior with the UNIFAC model. The water activities of ternary systems formed by a synthetic polymer, maltodextrin and water were also measured and used to test the predictive capability of both models.
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Water activity, Excess Gibbs energy, Phase equilibrium, Flory-Huggins, UNIFAC
Idioma
Inglês
Como citar
Brazilian Journal of Chemical Engineering. Brazilian Society of Chemical Engineering, v. 27, n. 1, p. 173-181, 2010.
