Covalent adaptable networks: smart, reconfigurable and responsive network systems

We presented Covalent Adaptable Network as the bridge from thermoset to thermoplastic behavior

Christopher J. Kloxin; Christopher N. Bowman

2013

Scholarcy highlights

  • This journal is c The Royal Society of Chemistry 2013Tutorial Review molding, these networks, by their very definition, are ‘‘set’’ when the crosslinking and/or polymerization reaction is complete, and the polymer networks formed become intractable, non-meltable, and unable to achieve any significant flow – they essentially will always ‘‘remember’’ the shape in which they were initially formed
  • The broadest class of polymer networks used as stimuli responsive materials is swollen gels, most commonly hydrogel materials, which respond to a change in a condition such as pH, temperature or ionic strength to trigger a change in equilibrium degree of swelling
  • Several distinctive approaches have been pioneered for creating networks that achieve the desired Covalent Adaptable Network behavior; their practical implementation and broader scale development have only been nascent
  • Each of these distinctive approaches based on reversible reactions such as cycloaddition reactions as exemplified by the DA reaction, trans-X reactions as exemplified by the transesterification reaction, and the addition–fragmentation reaction represent broad classes of reversible addition or reversible exchange reactions
  • Extensive work has been done to incorporate mechanically sensitive molecular structures into polymer networks, and it will be exciting to see the combination of these approaches with network reversibility and implementation in CANs
  • Techniques that can be used for permanently fixing the chemical structure at some point have value in a number of applications

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