目的 以κ-卡拉胶为研究对象，以黏度为指标考察流变学性质。研究放置时间、浓度、温度和阳离子种类对黏度的影响。方法 采用旋转黏度计测定黏度，通过对流变曲线进行幂律方程(Power law)拟合，确定流体流型;根据阿伦尼乌斯(Arrhenius)公式计算黏流活化能(Eη)，考察黏度与温度关系。结果 卡拉胶溶液的黏度随剪切速率的增大、温度的升高而减小，而随浓度的增加而增大，且黏流活化能与浓度正相关;加入不同种类阳离子后，黏度变化明显，其中KCl对黏度的影响最为显著。结论 卡拉胶溶液是假塑性流体，具有剪切稀化的特点;它的黏度受阳离子种类影响显著。
Abstract
OBJECTIVE To investigate the rheological property of Kappa carrageenan and the effects of standing time, concentration, and temperature on the viscosity of carrageenan solution.METHODS The fluid type was determined by fitting the rheological profiles to Power law model.The effect of temperature on the rheological behavior was investigated according to the viscous flowactivation energy(Eη) which was calculated by the Arrhenius formula. RESULTS The viscosity of carrageenan solution decreased with the increase of shear rate and temperature,whereas it increased with the concentration. There existed a positive correlation between Eη and concentration. Furthermore, the effects of different cations on the viscosity were also studied and the results indicated that the viscosity increased significantly with the ionic concentration, especially that of potassium chloride.CONCLUSION Carrageenan was inferred to be pseudo-plastic fluid which hasthe character of shear thinning effect and its viscosity is significantly affected by cationic species.
关键词
κ-卡拉胶 /
流变学性质 /
黏度 /
假塑性流体 /
阳离子 /
黏流活化能
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Key words
kappa carrageenan /
rheological property /
viscosity /
pseudo-plastic fluid /
cation /
flowactivationenergy
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中图分类号：
R944
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脚注
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基金
国家自然科学基金资助项目(81273445,81473161)
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