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Nitroxide mediated radical polymerization
Nitroxide-mediated radical polymerization is a method of radical polymerization that makes use of an alkoxyamine initiator to generate polymers with well controlled stereochemistry and a very low polydispersity index.〔Nicolas, J., et al. Prog. Polym. Sci., 2013, 38, 63–235〕 It is a type of Reversible-deactivation radical polymerization.
== Alkoxyamines ==
The initiating materials for nitroxide-mediated radical polymerization (NMP) are a family of compounds referred to as alkoxyamines. An alkoxyamine can essentially be viewed as an alcohol bound to a secondary amine by an N-O single bond. The utility of this functional group is that under certain conditions, homolysis of the C-O bond can occur, yielding a stable radical in the form of a 2-center 3-electron N-O system and a carbon radical which serves as an initiator for radical polymerization.〔Moad, G., Rizzardo, E. Macromolecules, 1995, 28, 8722–8728.〕 For the purposes of NMP, the R groups attached to the nitrogen are always bulky, sterically hindering groups and the R group in the O- position forms a stable radical, generally is benzylic for polymerization to occur successfully. NMP allows for excellent control of chain length and structure, as well as a relative lack of true termination that allows polymerization to continue as long as there is available monomer. Because of this it is said to be “living".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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