Flow, dynamic viscoelastic and creep properties of a biological polymer produced by Sphingomonas sp. as affected by concentration
作者： María del Carmen García González , Luis Alfonso Trujillo Cayado , José Antonio Carmona Gallego , José Muñoz García , María del Carmen Alfaro Rodríguez
DOI: 10.1016/J.IJBIOMAC.2018.09.100
关键词: Viscosity 、 Biopolymer 、 Creep 、 Viscoelasticity 、 Aqueous solution 、 Thermodynamics 、 Polymer 、 Materials science 、 Microstructure 、 Rheology
摘要: Abstract In this work, the influence of concentration on flow behaviour, dynamic viscoelastic and creep properties diutan gum in aqueous solution was investigated. Diutan is a biopolymer which belongs to sphingans group. To know its rheological microstructure as function directly related current future applications biological polymer. Mechanical spectra showed crossover point between G′ G″ changed concentration. A master curve for frequency dependence η* obtained. The compliance results made it possible deduce yield stress value they were fitted Burgers model. shear-thinning behaviour exhibited by solutions, Carreau-Yasuda Higher G′, G″, τ0 η0 values lower ωc, Je0, γ c n obtained increasing concentration, being modulate viscoelasticity, viscosity shear resistance more complex structure with stronger entanglements macromolecules when increases.
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