effects of polyacrylamides with different hydrolysis at thailand

effects of polyacrylamides with different hydrolysis at thailand
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  • How does pH affect polyacrylamide hydrolysis?
  • Muller et al. , proposed that polyacrylamides would hydrolyze under slightly acidic conditions (pH = 4), and reported that the molecular weight of the polymer remained relatively stable during hydrolysis. Thomas et al. , investigated the effects of different pH conditions and reaction times on the hydrolysis process.
  • Does hydrolysis affect the nitrogen content of polyacrylamides?
  • Fig. 9 shows the variation of nitrogen content as a function of polymer concentration from 100 ppm to 1000 ppm of partially hydrolyzed polyacrylamides with the hydrolysis degrees of 30%, 45%, and 57%, respectively. Also, the experimental results show that the nitrogen contents of high HD polyacrylamides are lower than that of low HD ones.
  • Does polyacrylamide hydrolyze under acidic conditions?
  • As reported by Muller et al., polyacrylamides undergo hydrolysis under acidic conditions to yield poly (acrylamide-co-acrylic acid). Amide groups will completely hydrolyze under conditions of appropriately low pH, and polymer weight will remain relatively stable during hydrolysis, as the following formula , , .
  • Can polyacrylamide contribute to residual polymer formation?
  • Common methods for treating PAM are membrane filtration 25, thermal distillation 24, oxidation treatment 26, and biological treatments 27. However, addressing the challenge posed by PAM remains a pressing issue within the industry. Fig. 1: Polyacrylamide and its fragments may contribute to residual polymer formation.