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- W2092151905 abstract "The viscoelastic properties of aqueous solutions of the polysaccharide guar galactomannan have been studied using dynamic oscillatory, steady and transient shear methods. At the concentrations studied, e.g. 1, 2 and 3% w/w, ([η] = 8.8) a typical ‘entanglement’ network response has been observed, with liquid-like behaviour at low frequencies, linear strain dependence up to ∼0.4 and Cox-Merz superposition of η∗(ω) and η(γdot). The evolution of shear stress during start shear experiments (stress overshoot) has been observed and the peak strain (γ∞) found to be independent of shear rate and within experimental error, independent of concentration, having a value of ∼2.1 strain units. For the highest concentration used, (3% w/w), the normal stress overshoot was also observed and the peak strain value found to be ∼20 strain units with significant dependence on shear rate. Stress relaxation measurements have shown measurable residual stress decaying within a few seconds to baseline noise. The effect of mechanical history on sample response was examined by monitoring the stress overshoot ratio after known ‘recovery’ times; this was found to stabilize after times of the order of 102 s, suggesting all of the temporary network structure could reform in this time. The results obtained are discussed in terms of theories for the molecular viscoelasticity of polymer solutions well known to workers in the area of synthetic polymers, but so far applied only to a very limited extent to aqueous polysaccharide solutions." @default.
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- W2092151905 date "1987-10-01" @default.
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- W2092151905 title "Non-linear viscoelasticity of polysaccharide solutions. 1: Guar galactomannan solutions" @default.
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- W2092151905 doi "https://doi.org/10.1016/0141-8130(87)90062-6" @default.
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