You are in the accessibility menu

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
Author(s): 
Institution: 
  • Universidade Estadual de Campinas (UNICAMP)
  • Universidade de São Paulo (USP)
ISSN: 
0104-6632
Sponsorship: 
  • 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)
Abstract: 
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.
Issue Date: 
1-Mar-2010
Citation: 
Brazilian Journal of Chemical Engineering. Brazilian Society of Chemical Engineering, v. 27, n. 1, p. 173-181, 2010.
Time Duration: 
173-181
Publisher: 
Brazilian Society of Chemical Engineering
Keywords: 
  • Water activity
  • Excess Gibbs energy
  • Phase equilibrium
  • Flory-Huggins
  • UNIFAC
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/122262
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

There are no files associated with this item.
 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.