Please use this identifier to cite or link to this item:
http://acervodigital.unesp.br/handle/11449/122262
- Title:
- Water activity of aqueous solutions of ethylene oxide-propylene oxide block copolymers and maltodextrins
- Universidade Estadual de Campinas (UNICAMP)
- Universidade de São Paulo (USP)
- 0104-6632
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
- 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.
- 1-Mar-2010
- Brazilian Journal of Chemical Engineering. Brazilian Society of Chemical Engineering, v. 27, n. 1, p. 173-181, 2010.
- 173-181
- Brazilian Society of Chemical Engineering
- Water activity
- Excess Gibbs energy
- Phase equilibrium
- Flory-Huggins
- UNIFAC
- Acesso aberto
- outro
- http://repositorio.unesp.br/handle/11449/122262
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