Artículo
Flow, dynamic viscoelastic and creep properties of a biological polymer produced by Sphingomonas sp. as affected by concentration
Autor/es | García González, María del Carmen
Trujillo-Cayado, Luis Alfonso Carmona Gallego, José Antonio Muñoz García, José Alfaro Rodríguez, María del Carmen |
Departamento | Universidad de Sevilla. Departamento de Ingeniería Química |
Fecha de publicación | 2019-03-15 |
Fecha de depósito | 2024-01-02 |
Publicado en |
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Resumen | In this work, the influence of the concentration on the flow behaviour, dynamic viscoelastic and creep properties of diutan gum in aqueous solution was investigated. Diutan gum is a biopolymer which belongs to the sphingans ... In this work, the influence of the concentration on the flow behaviour, dynamic viscoelastic and creep properties of diutan gum in aqueous solution was investigated. Diutan gum is a biopolymer which belongs to the sphingans group. To know its rheological properties and its microstructure as a function of the concentration is directly related to the current and future applications of this biological polymer. Mechanical spectra showed a crossover point between G′ and G″ which changed as a function of diutan gum concentration. A master curve for the frequency dependence on the η* was obtained. The creep compliance results made it possible to deduce the yield stress value and they were fitted to Burgers model. A shear-thinning behaviour was exhibited by diutan gum aqueous solutions, which was fitted to the Carreau-Yasuda model. Higher G′ G″ τ0 and η0 values and lower ωc, Je 0, γ̇c and n values were obtained by increasing the gum concentration, it is being possible to modulate the viscoelasticity, viscosity and shear resistance as a function of concentration. A more complex structure with stronger entanglements between macromolecules of diutan was obtained when the concentration of diutan increases. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | CTQ2015-70700-P |
Cita | García González, M.d.C., Trujillo-Cayado, L.A., Carmona Gallego, J.A., Muñoz García, J. y Alfaro Rodríguez, M.d.C. (2019). Flow, dynamic viscoelastic and creep properties of a biological polymer produced by Sphingomonas sp. as affected by concentration. International Journal of Biological Macromolecules, 125, 1242-1247. https://doi.org/10.1016/j.ijbiomac.2018.09.100. |
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