hydrophobically associating polyacrylamides and their in america

hydrophobically associating polyacrylamides and their in america
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  • What are hydrophobically associating polyacrylamides (hapams)?
  • Of particular interest in this class are hydrophobically associating polyacrylamides (HAPAMs), derived from polyacrylamide by introducing a relatively low amount (generally less than 2 mol%) of hydrophobic pendent groups .
  • Why are hydrophobically modified polyelectrolytes more important than hhapams?
  • For hydrophobically modified polyelectrolytes like HHAPAMs, this is more important since there are two opposing effects existed simultaneously: hydrophobic aggregation and Colombic repulsion.
  • How can hydrophobic moieties be incorporated on water soluble polymer chains?
  • Basically, there are two ways to incorporate hydrophobic moieties on to water-soluble polymer chains , i.e. direct copolymerization of hydrophobic and hydrophilic monomers, or post-modification of the parent water-soluble polymer.
  • How is acrylamide polymerized?
  • A given amount (0.25 mol, 17.77 g) of acrylamide was dissolved in 500 ml water followed by 30 min purified nitrogen purge. 2.5 ml of 0.1 mol l −1 KPS and TMEDA aqueous solutions were then injected successively. The polymerization was conducted at 30.0±0.1 °C with a thermostatically controlled water circulating bath.