Rheological properties of guar gum and hydroxyethyl guar gum in aqueous solution |
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Authors: | SP Patel G Ranjan VS Patel |
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Institution: | Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, India 388120 |
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Abstract: | The rheological properties of aqueous solutions of guar gum (GG) and hydroxyethyl guar gum (HEG) have been investigated. The flow properties of these polysaccharide solutions were studied at the shear rate in the range 1.5–1310s−1 using a Rheotest-2 viscometer. The flow of these polysaccharide solutions was described by equation of state based on Cross model. The basic rheological parameters, like zero shear rate viscosity (ηo), elasticity modulus (Go) and relaxation time (glo) were calculated using simple and established relations. Master viscosity curves indicated that the molecular weight distribution of native guar gum has been changed by hydroxyethylation under specified reaction conditions. The effect of concentration and temperature on ηo and λo has been studied, and the relations among these were established by simple equations. |
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Keywords: | Guar gum rheological behaviour shear rate viscosity elasticity relaxation time |
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