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ATRP or Atom Transfer Radical Polymerization is a polymerization reaction involving free radicals. It was introduced as an extension to ATRA or Atom Transfer Radical Addition by Matyjaszewski et al (1995). As a living radical polymerization which is a form of living polymerization, it allows the reaction to be carried out in a controlled way, and can be used to obtain polymers with high molecular weight and low polydispersity index.
This control result from the use of a copper based catalyt. This catalyst provides an equilibrium between active, and therefore propagating, polymer and an inactive form of the polymer; known as the dormant form. By lowering the concentration of radicals, termination is supressed and control is achieved.
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