dynamical studies on low molecular weight polyacrylamide in russia

dynamical studies on low molecular weight polyacrylamide in russia
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  • What is copper-catalyzed controlled polymerization of acrylamide?
  • Copper-catalyzed controlled polymerization of acrylamide (AM) has always been a challenge, which typically exhibits low monomer conversion and broad molecular weight distribution (MWD) or requires complex/multistep reaction procedures, due to the highly active nature of the AM radical and its side reactions.
  • Does pentamethyldiethylenetriamine (PMDETA) narrow dispersity?
  • (11) In a later report, significantly narrowed dispersity of PAMs (Đ = 1.24–1.25) was achieved by utilizing pentamethyldiethylenetriamine (PMDETA) as the ligand; however, monomer conversion was quite low, which only reached 9%.
  • Does polymerization lead to a limited monomer conversion?
  • However, this polymerization led to broad MWDs (Đ > 2.5, entry 2 in Table 1) with obvious tails in the size exclusion chromatography (SEC) traces (Figure S1), indicating that severe chain terminations occurred. This resulted in a limited monomer conversion, only 31.1% was reached in 75 min, and a poor control over the chain growth. Table 1.