Tween 80浊点的测定及其影响因素

Determination of the Cloud Point of Tween 80 and Its Influencing Factors

测定非离子表面活性剂Tween 80的浊点,研究无机盐、醇、pH等对非离子表面活性剂Tween 80浊点的影响。试验结果表明,具有盐析性的无机盐的溶水能力大于胶束溶水能力,这使非离子表面活性剂析出,导致非离子表面活性剂的浊点降低;阴离子大于阳离子对浊点的影响,硫酸根>氯离子>硝酸根;有机醇中甲醇、乙醇略微升高浊点温度,而异丙醇则明显降低浊点温度;随着pH升高, Tween 80浊点温度随之降低。

The cloud point of non-ionic surfactant Tween 80 was measured,and the effects of different additives such as inorganic salts,alcohol and pH on the cloud point of Tween 80 were studied.The results showed that the ability of salting-out inorganic salt to dissolve water was greater than that of micellar water-solubilizing so that the non-ionic surfactant was precipitated,which led to the decrease of the cloud point of the non-ionic surfactant.The effect of anion on cloud point was greater than that of cations,and sulfate>chloride ion>nitrate;Methanol and ethanol in organic alcohol slightly increased the cloud point temperature,while isopropanol significantly decreased the cloud point temperature;With the increase of pH,the cloud point temperature decreased.