Rheological properties of guar galactomannan and rice starch mixtures. II. Creep measurements

被引:28
|
作者
Rayment, P [1 ]
Ross-Murphy, SB [1 ]
Ellis, PR [1 ]
机构
[1] Univ London Kings Coll, Div Life Sci, Biopolymers Grp, London W8 7AH, England
关键词
D O I
10.1016/S0144-8617(97)00231-2
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The effect of particulate inclusions, or 'fillers', on the rheological properties of a typical polysaccharide entanglement solution (guar galactomannan/water) have been studied. Earlier steady shear experiments have shown an apparent upswing of the viscosity-shear rate profiles at low shear rates, with higher filler concentrations (Rayment et al., 1995). In creep experiments, a low constant stress is applied to the sample. In the present paper, the creep experimental data have been compared to the steady shear how behaviour fitted by the yield stress modified Cross equation (introduced in Part I of this series). The apparent zero-shear viscosity and yield stress parameters have been constrained in a number of ways in the model to establish the effect of these parameters on the modified Cross model. Although the creep data appears to alter the precision of the modified Cross equation, due to the low shear rates accessed, the apparent upswing of the steady shear data at low shear rates appear to be supported by the data described in this paper. This lends further credibility to the scaled filler models introduced previously. (C) 1998 Elsevier Science Limited. All rights reserved.
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收藏
页码:55 / 63
页数:9
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