Date of Publication:2008-01-01

Journal:化学进展

Volume:20

Issue:11

Page Number:1726-1732

ISSN No.:1005-281X

Abstract:Novel methods of fine tuning initiation, activation, and deactivation processes for atom transfer radical polymerization (ATRP) are reviewed, including reverse ATRP, simultaneous reverse and normal initiation (SR&NI) ATRP, activators generated by electron transfer (AGET) ATRP, activators regenerated by electron transfer (ARGET) ATRP and initiators for continuous activator regeneration (ICAR) ATRP. These new systems gradually circumvent the oxidation problem of normal ATRP system and employ small amount of catalysts in the higher oxidation state, especially the latter two initiation systems whereby only minor amount (1-50ppm) of high-oxidation-state transition metal complex is needed to mediate polymerization and therefore greatly simplify the commercial procedures of ATRP method, making it to be applicable for industrial production. In addition, two novel catalyst systems for ATRP system, hybrid and bimetallic catalyst systems developed on the basis of immobilized catalyst, are thoroughly introduced. Both of them show high catalytic activity and capability to control the polymerization reaction and can be removed mostly by simple filtration or precipitation.

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