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The effects of granule size and size distribution on rheological behavior of hydroxypropylated and phosphate cross‐linked potato starch (HPS) were studied by steady and dynamic viscoelasticity measurements. The rheological behavior of starch dispersions was strongly influenced by granule size and granule‐to‐granule interaction. Average granule size of HPS dispersion at high concentration was smaller than that at low concentration. Time dependence of viscosity was quite different depending on shear rate; thixotropy at low shear rates and antithixotropy at high shear rates. At higher concentrations, HPS dispersion showed a non‐Newtonian behavior, and it tended to a Newtonian behavior when concentration was lowered. Yield stress and creep recovery of HPS dispersion at higher concentrations was more pronounced than those at lower concentrations.
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MORIKAWA et al. (2002) studied this question.
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