疏水缔合聚丙烯酰胺临界质量浓度的计算

The Critical Concentration Calculation of Hydrophobically Associating Polyacrylamide

通过模型设计来计算疏水缔合聚丙烯酰胺在溶液中形成网络结构即黏度发生突变时所需的质量浓度,并与实测值进行了比较。研究结果表明,对于疏水缔合聚丙烯酰胺,在蒸馏水中,计算出的疏水缔合聚丙烯酰胺的临界质量浓度小于实际测量值,二者差距较大;在盐浓度为0．3-0．8 mol／L,采用松散排列模型得到的临界质量浓度与实际测量值很接近,采用紧密接触模型得到的临界质量浓度则比实测值略大;相反,在盐浓度为1 mol/L．的溶液中,采用松散排列模型得到的临界质量浓度与实际测量值的差距较大,采用紧密接触模型得到的临界质量浓度与实测值很接近。而在相同条件下,聚丙烯酰胺Mo-4000的临界质量浓度的计算值均比实际测量值小, 并且差距较大。

The critical concentration of network formation, which is related to the viscosity break of hydrophobically associating polyacrylamide, is calculated by model design and compared with the measured value. In pure water, there is a great difference between the calculated value and the measured one. When salt concentration is in the range of 0. 3-0. 8 mol/L, the values calculated by loose contact model are approaching to the measured ones, while the values calculated by compact contact model are somewhat larger than the measured ones. When salt concentration is up to 1 mol/L, on the contrary, the value calculated by compact contact model is more approaching to the measured one than the value calculated by loose contact model. For Mo - 4000, however, there is a great difference between the calculated value and the measured value whenever in pure water or in brine.