temperature tolerance phpa polyacrylamide/view phpa at germany

temperature tolerance phpa polyacrylamide/view phpa at germany
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  • What is partially hydrolyzed polyacrylamide (PHPA)?
  • Partially hydrolyzed polyacrylamide (PHPA) is the most frequently used polymer in this respect, owing to its low cost, viscosifying nature, and well-known physiochemical properties (Urbissinova et al. 2010 ). The molecule of this polymer is a flexible chain which remains in coil-like structure in the absence of a shearing effect.
  • What is the temperature of cross-linked polyacrylamide gel?
  • Deng ( Deng et al., 2018) experimentally studied cross-linked polyacrylamide gel using the microencapsulated initiator to control the gelation time, yet temperature of this gel is limited to 90 °C for application.
  • 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.
  • Does PHPA's molecular weight affect viscoelastic moduli?
  • In order to investigate the effect of PHPA’s molecular weight on the viscoelastic moduli (G’ and G”) of the formed gels, gelant samples prepared with three different PHPAs (PHPA1, PHPA2, PHPA3) at 5000 ppm and a fixed PEI concentration of 1000 ppm, were cured at 80 °C.