Characteristics of sodium p-styrenesulfonate modified polyacrylamide at high temperature under dual scale boundary

In deep oil and gas operations, as well as in carbon capture, utilization, and storage, the temperature resistance of polyacrylamide is becoming increasingly critical. This paper investigates the temperature resistance of polyacrylamide from both microscopic and mesoscopic perspectives. Molecular dynamics simulation results indicate that the incorporation of sodium p-styrenesulfonate can increase the radius of gyration of polyacrylamide at high temperatures (increased by 2.97% at 180 °C) and decrease its diffusion coefficient (decreased by 33.94%) in water, effectively enhancing its temperature resistance. However, the decrease in hydrogen bonding was 17.39%. Additionally, the spatial network structure of the polymer obtained from scanning electron microscope images is parameterized using ImageJ software. The average values of area, perimeter, and width increased by 6.5%, 97.52%, and 275.86%, respectively, compared to the initial values, while the average value of skeleton width increased by 61.48% and 412.6%, respectively. Parameters such as pore area and width, along with an increase in fluctuation level, lead to a decrease in viscosity. The parameterization of the spatial network structure serves as a bridge between material structure and performance and also expands the application of spatial network structures in fields such as materials science and chemistry.

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