低浓度白芨葡甘聚糖溶液的流变性研究

研究了低浓度白芨葡甘聚糖(BSG)溶液的流变性与多糖浓度、外加电解质浓度、pH值及温度等的相关性。结果表明,BSG水溶液在2～16g.L-1时是假塑性流体。在低剪切速率下(γ.1s-1),溶液的表观黏度η迅速降低;剪切速率增大(γ.1s-1),溶液的η达到稳定(ηs)。在高剪切速率下溶液的ηs随浓度的增加而增加。向溶液中加入电解质,或者改变pH值,都不会影响ηs。对质量浓度为16g.L-1的BSG溶液,升高温度,η降低,η与温度的关系符合Arrhenius方程。

Rheological properties of Blettila striata polysaccharide solutions

The effect of polysaccharide concentration, electrolyte concentration, pH value and temperature (T) on the rheological behaviors of Blettila striata polysaccharide solutions was studied. The solutions of polysaccharide concentration between 2 and 16 g·L^-1 were pseudoplastic fluids. The apparent viscosity (η) of solutions decreased with increasing shear rate  (γ)in the range of γ<1s^-1; while η became constant  (η_s)  for γ>1s^-1. ηs rose with polysaccharide concentration, while salt concentration and pH had nothing to do with ηs. ηof solution at 16 g·L^-1 lowered with rising T. The relationship between η and T conformed to the Arrhenius equation.