What is partially hydrolyzed polyacrylamide (HPAM)?

Partially hydrolyzed polyacrylamide (HPAM) was widely implemented to improve the rheological properties of displacing fluids, but the high temperature and salinity of the reservoir brine limited their applications.

Can nitrogen digestion determine the concentration of polyacrylamide-type polymers?

Conclusions The nitrogen digestion method is an effective way for determining the concentration of polyacrylamide-type polymers, including partially hydrolyzed polyacrylamide, sulfonated polyacrylamides, and cationic polyacrylamides.

What is the hydrolysis degree of polyacrylamide sulfonated polymer?

Using this alkaline post hydrolysis method, we obtained partially hydrolyzed polyacrylamides with hydrolysis degree of 45%, and 56% and hydrolyzed sulfonated polyacrylamides with hydrolysis degree of 9%, 10%, 13% and 17%. 2.7. Infrared (IR) spectra of polymers The drop preparation method was used in the IR analysis.

Does hydrolysis affect the nitrogen content of polyacrylamides?

Fig. 9 shows the variation of nitrogen content as a function of polymer concentration from 100 ppm to 1000 ppm of partially hydrolyzed polyacrylamides with the hydrolysis degrees of 30%, 45%, and 57%, respectively. Also, the experimental results show that the nitrogen contents of high HD polyacrylamides are lower than that of low HD ones.

What is the viscosity retention of polyacrylamide in pure water?

In pure water, the sample viscosity retention at 90 o C is about 38% of that value at 25 o C (Supplementary Figure S2D), which is comparable with the hydrophobically associating polyacrylamide under similar conditions (Zheng and Huang, 2019).

Are polyacrylamide-degrading bacterial strains isolated from soil?

Two polyacrylamide-degrading bacterial strains were isolated from soil, Bacillus sphaericus and Acinetobacter sp., utilizing 16–19% polyacrylamide after 14 days of cultivation (Matsuoka et al., 2002).