impact of salts on polyacrylamide hydrolysis and gelation for sale

impact of salts on polyacrylamide hydrolysis and gelation for sale
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  • Do salts elongate the gelation time of Pam/PEI system?
  • The effects of salts [sodium chloride (NaCl) and ammonium chloride (NH4Cl)] on the degree of hydrolysis (DH) of PAM were investigated. These salts were used as retarders to elongate the gelation time of the PAM/PEI system. The data obtained from 13C-NMR was used to understand the retardation mechanisms by salts.
  • How does salt affect gel formation?
  • Generally, salts work as retarders to the gelation of the crosslinked gels [26, 38]. Adding 0.1% NaCl decreased the storage modulus of the gel formed of 3.5% CoAc/9% PaM by 70% to about 360 Pa (Figure 14), whereas no gels were identified at higher salt concentrations and when seawater was used. ...
  • Is polyethylenimine a crosslinker for Pam alkaline hydrolysis?
  • Polyacrylamide (PAM) and its derivatives are the most commonly used polymers in the preparation of polymeric gels for water control in petroleum reservoirs. This study involved the use of polyethylenimine (PEI) as a crosslinker for PAM. In this study, we investigated PAM alkaline hydrolysis at high temperatures.
  • How do salts affect gelation?
  • In this case, the presence of salts affects the gelation through the sodium ions (Na + ) which tend to screen the negatively charged carboxylate groups (COO − ) through the charge shielding effect reducing consequently the hydrodynamic volume of the polymer.