pH及盐对CMC流变特性的影响研究

Study on effects of pH and salt on the rheological properties of CMC

应用单因素五水平方差分析法,研究柠檬酸及乳酸不同pH对CMC溶液流变特性的影响。结果表明,在α=0.05水平不同酸对零剪切黏度、黏度、黏度衰减、弹性模量、黏性模量及复合黏度无明显差异;pH≥6时pH对各特性指标无明显影响,pH<6时随pH下降除黏度衰减减弱外,其余各特性指标出现明显下降。另外,应用单因素六水平方差分析法研究不同柠檬酸钠及不同三聚磷酸钠含量对CMC流变特性的影响,结果表明,在α=0.05水平不同柠檬酸钠浓度除黏度衰减外对其余指标有明显影响,不同三聚磷酸钠浓度除黏度衰减及损耗正切外对其余指标有明显影响,柠檬酸钠及三聚磷酸钠对所有特性指标的影响无明显差异。另外,发现盐浓度与零剪切黏度、黏度、复合黏度及弹性模量、黏性模量之间存在高度相关性,经方程拟合得到一系列方程。

The effect of citric acid and lactic acid on the basis of different pH on the rheological properties of CMC solution were studied with the method of monofactorial five-level variance analysis.The results show that different acid has no significant effect on the zero-shearing viscosity,viscosity,viscosity damping,elasticity modulus,viscous modulus and dynamic viscosity as well on the level when α equals to 0.05.When pH was below 6,other properties declined obviously except viscosity damping,while pH was greater than 6（included）,pH had no visible effect on all the properties.Meanwhile,the effect of different concentration of sodium citrate and sodium tripolyphosphate on the rheological properties of CMC solution were also studied.The results show that on the level when α equals to 0.05,the concentration of sodium citrate had significant effect on other properties except viscosity damping and that of sodium tripolyphosphate had significant effect on other properties except viscosity damping and viscoelasticity ratio,while there was no difference between sodium citrate and sodium tripolyphosphate.In addition,zero-shearing viscosity,viscosity,dynamic viscosity,elasticity modulus and viscous modulus highly correlate to the concentration of salt and a series of equations are obtained by the way of equation fitting.