high molecular weight chemical phpa used in high in luxembourg

high molecular weight chemical phpa used in high in luxembourg
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  • What is the molecular weight of PHPA vs PEI polymers?
  • The polymers had molecular weights that varied from 5 to 10 × 10 6 g/mol for PHPAs with initial hydrolysis degrees between 6 and 20 mol%, while the molecular weights of the PEI were between 2 and 67 × 10 4 g/mol with a constant branching degree of 57–59.
  • What is the molecular weight of a PHPA?
  • According to O’Neill and Reese (1999), the commercial PHPAs used in civil engineering typically have a molecular weight ranging from 14 to 1 7 m i l l i o n g / m o l and a surface charge density (degree of hydrolysis) from 30 to 45%.
  • How does polymer concentration affect the behavior of PHPA fluids?
  • Recall that PHPA fluids are solutions of synthetic polymers not clay suspensions and thus they can be expected to display different behavior. As regards the effect of polymer concentration, it can be seen from Fig. 6 that as the concentration increases, the values of both moduli also increase.
  • Does PHPA affect the viscosity of water based fluids?
  • Due to its high molecular weight, PHPA quickly viscosifies with increased concentrations. The use of PHPA in drilling fluid formulation will affect its viscosity. A rheological study on PHPA in water is sufficient to know the influence of PHPA on the viscosity of water-based fluids.