刺槐豆胶/瓜尔豆胶复合体系的流变学性质研究

Studies on the rheological properties of locust bean gum ( LBG) and guar gum ( GG) mixed system

摘要: 研究刺槐豆胶(LBG)/瓜尔豆胶(GG)复合体系的流变学性质,并采用流变学的模型进行拟合分析。实验表明:BG/GG复合体系为非牛顿流体,流动曲线服从Carreau模型,随着LBG比例的增大,其粘度越小,非牛顿性越不明显,触变性越低。LBG与GG复配对粘度的影响可产生协同作用,LBG/GG=1∶9时,复合体系粘度最大。在频率扫描范围内,LBG/GG复合体系同时具有粘性和弹性,随不同的角频率处理展现不同的动态粘弹性行为,LBG/GG=1∶9时,复合体系的动弹粘弹性最大。

Abstract: The rheological properties of locust bean gum ( LBG) /guar gum ( GG) mixed systems were studied, and the rheological models were used to analyze the flow behavior. The results showed that the LBG/GG composite systems exhibited non-Newtnian behavior which was found to be well correlated to the Carreau model. With the increase of the LBG ratio, the viscosity of the LBG/GG mixed systems were smaller and the non-Newtonian property became less obvious, the lower the thixotropy.The effect of LBG and GG on viscosity had synergistic effect, and when LBG/GG = 1 ∶ 9, the viscosity of the composite system was the largest. The LBG/GG composite systems with viscosity and elasticity exhibited different dynamic viscoelastic behaviors with different angular frequencies.The dynamic viscoelasticity of the composite system which LBG/GG =1∶ 9 was the largest.