碱对部分水解聚丙烯酰胺溶液与煤油界面性质的影响

Effects of alkali on the interfacial properties of partially hydrolyzed polyacryamide(HPAM) and kerosene

应用乌式粘度计和电导率仪,采用动态光散射法,测定了加碱前后聚合物溶液的部分水解聚丙烯酰胺分子线团粒径分布、体相粘度和电导率,考察了NaOH对部分水解聚丙烯酰胺的分子链、水解和溶液离子强度的影响。用界面剪切粘度仪、Zeta电位仪和界面张力仪研究了NaOH的加入对部分水解聚丙烯酰胺与煤油之间界面性质的影响。结果表明:随着放置时间的延长,聚合物溶液自身会发生降解;碱使溶液中的离子强度增加,聚合物溶液在碱性环境下水解。碱导致聚合物溶液电导率增加,体相粘度下降,但对聚合物分子链没有明显影响。在界面性质方面,加碱后,聚合物溶液界面张力有所下降,油水界面剪切粘度大幅下降,离子强度和碱性水解的双方面原因导致了Zeta电位负值先增加,再逐渐减小。

The effects of NaOH on the molecular chain,hydrolysis and ion-strength of partially hydrolyzed polyacryamide (HPAM) were re-searched by the measurement of the grain-size distribution,bulk phase viscosity and electric conductivity using dynamic light-scattering method,Ubbelodhe viscosimeter and electric conduc-tivity equipment. The effects of NaOH on the interfacial proper-ties of HPAM and kerosene were studied by the measurement of the zeta potential,interfacial shear viscosity,interfacial tension. The results show that HPAM self-degrades with time. With the join of NaOH,ion intensity will increase and the polymer solution will hydrolyze. Electrical conductivity will increase with the bulk phase viscosity decrease but its chain will not break. The interfa-cial tension of the polymer solution will decrease with NaOH,so the interfacial shear viscosity between the water and model oil will decrease at a large scale. Because of the increase of ion in-tensity and the hydrolyzed HPAM in NaOH system,the negative value of Zeta potential on the oil droplets will increase at first,then decrease gradually.