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The rheology of aqueous solutions of guar is studied over a wide range of shear rates and concentrations. At sufficiently low and high shear rates guar solutions show regions of Newtonian behavior, while at intermediate shear rates they are pseudoplastic. Preliminary normal stress data, and the effects of salt concentration are discussed. Molecular size distribution profiles of hydrated guar, obtained by low pressure (20 psig) filtration through Nucleopore filter membranes, are discussed in terms of guar purity.
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Whitcomb et al. (1980) studied this question.
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