| DESCRIPTION |
A third type of controlled radical polymerization that has received a lot of attention in recent years is known as nitroxide-mediated polymerization (NMP). "The polymerization is controlled by a stable nitroxide radical present in the polymerization mixture," explained Craig J. Hawker, research staff member at IBM Almaden Research Center, San Jose, Calif. "The process relies on the reversible capping of radical chain ends by the nitroxide radical," he said. "Capping decreases the concentration of the polymeric radical chain ends in the reaction mixture, and the polymer chains therefore spend most of their time in a dormant state. The chain reactivates by homolysis of this bond at elevated temperatures, which allows addition of more monomer units. The mediating nitroxide radical then caps the chain and forms the dormant species." |
| UPDATE | 09.02 |
| AUTHOR | IBM's Almaden Research Center's Craig J. Hawker |
| LITERATURE REF. | This data is not available for free |
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