添加剂的浓度对非离子表面活性剂AEO_9浊点的影响

Effect of Concentrations of Additives on the Cloud Point of Nonionic Surfactant AEO_9

各类添加剂都能对非离子表面活性剂的浊点产生影响。今研究了离子型表面活性剂、增溶物和电解质类添加剂在不同浓度下对非离子表面活性剂AEO9浊点的影响。其中离子型表面活性剂和增溶物类添加剂可在极低的浓度上改变AEO9的浊点,且随着添加剂加入浓度的增加,AEO9的浊点也逐渐增加,当添加剂浓度达到离子型表面活性剂或增溶物的临界胶束浓度时,AEO9的浊点将出现急剧上升。而电解质类添加剂对AEO9浊点的影响表现出具有临界浓度现象,只有当添加剂的浓度达到相应的临界浓度之后,具有盐析效应的电解质将使AEO9浊点线性下降,而具有盐溶效应的电解质则使AEO9浊点线性升高,且不同电解质相应的临界浓度随着其阴离子的感胶离子数的增大而线性增加,同时其对AEO9浊点的改变程度则随着阴离子的感胶离子数的增大而线性下降。

The effects of various additives, such as ionic surfactants, hydrotrope and electrolytes, on the cloud point of the nonionie surfaetant AEO9 （dodeeyl polyethoxyethanol with average 9 moles of oxyethylene） were studied. It is found that the added ionic surfaetants or hydrotrope with ultra low （monomerie） concentration can change the cloud point of AEO9, and the cloud point increases gradually with increasing the concentration of ionic surfaetants or hydrotrope at first, then it sharply increases suddenly when the concentration of the ionic surfaetants or hydrotrope reaches its respective critical micelle concentration. The effect of the added electrolytes on the cloud point of AEO9 shows that there exists a critical concentration of added electrolytes, only reach or over this concentration, the salt-out electrolytes will linearly decrease the cloud point, while the salt-in electrolytes will increase the cloud point linearly. In addition, this critical concentration of added electrolyte also increases linearly with the increase of the lyotropie number of its anions and at the same time the magnitude of the effect of various electrolytes on the cloud point of AEO9 decreases linearly with increasing the lyotropie number of anions.