polyacrylamide/phpa/polyacrylamide/phpa direct in netherlands

polyacrylamide/phpa/polyacrylamide/phpa direct in netherlands
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  • How does PHPA affect fluid rheology?
  • The introduction of higher molecular weight synthetic polymers typified by partially hydrolysed polyacrylamide (PHPA) allowed the same effect on fluid rheology to be achieved at much lower additive concentrations, a major practical advantage.
  • How is cross-linked polyacrylamide gel prepared?
  • Preparation of polyacrylamide gel Cross-linked polyacrylamide gel was prepared by free radical polymerization of AM and MBA in aqueous solution with encapsulated initiator. 7% (w/v) AM, 0.5% (w/v) MBA and 5% (w/v) NaCl were dissolved in 300 mL distilled water at room temperature for 30 min until totally dissolved.
  • What is the concentration of PHPA in silica nanoparticles?
  • The test was carried out with a 0.5 wt% silica nanoparticles concentration, 1 wt% PHPA concentration at a constant temperature of 87.4 °C, and shear rate of 100 s −1. Variation in viscosity was determined at different brine concentrations from 1 to 3 wt%.
  • What happens if a polyacrylamide gel is high in Salt?
  • Since high concentration of salt leads to the excessive electric charge of gel system, which will compress polyacrylamide will be compressed, and the viscosity and the cross-linking density of polymer will be reduced ( Guan et al., 2018; Shuang et al., 2018; An et al., 2016; Xin et al., 2018 ). Fig. 12.