alkaline hydrolysis of polyacrylamide and study on poly in canada

alkaline hydrolysis of polyacrylamide and study on poly in canada
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  • Does pH affect hydrolysis of polyacrylamide hydrogels?
  • Raman spectroscopy confirmed hydrolysis of polyacrylamide hydrogels in both acidic and basic environments over the course of 10 days at room temperature (Fig. 5 a), while swelling measurements indicated a volume increase with increasing pH (Fig. 3 b).
  • Are polyacrylamide hydrogels equilibrated?
  • Our results suggest that polyacrylamide hydrogels equilibrated in highly basic conditions, even at mild temperatures, are subject to hydrolysis, which can reduce friction coefficient and elastic modulus.
  • Why did methylenebisacrylamide amide hydrolysis occur?
  • Rather our gels may have exhibited greater hydrolysis due to the high pH of our solution (pH = 13.5 as opposed to pH ≈ 8–9). Since N,N ′ - methylenebisacrylamide (MBAm) is used as the crosslinker, amide hydrolysis of the crosslinker may have occurred in addition to side chain hydrolysis.
  • How does pH affect the friction coefficient of polyacrylamide hydrogels?
  • For polyacrylamide hydrogels in sliding contact with glass hemispherical probes, friction coefficients decreased from µ = 0.07 ± 0.02 to µ = 0.002 ± 0.002 (redox-initiated) and from µ = 0.05 ± 0.03 to µ = 0.003 ± 0.003 (UV-initiated) with increasing solution pH.