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Progress in Chemistry 2007, Vol. 19 Issue (9): 1406-1412 Previous Articles   Next Articles

• Review •

The Investigation of Living/Controlled Free Radical Polymerization under γ-ray Irradiation

Ge Xueping; Bai Ruke**   

  1. (Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China)
  • Received: Revised: Online: Published:
  • Contact: Bai Ruke
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The progress in the investigation of controlled/living free radical polymerizations under γ-ray irradiation condition was reviewed. Although γ-ray initiated polymerization is uncontrolled in conventional condition, controlled/living free radical polymerization has been successfully carried out under γ-ray irradiation in the presence of thio-compounds, such as dithioesters or trithiocarbonates. The molecular weight of the obtained polymers in the process can be controlled with narrow distribution and increases linearly with monomer conversion. Block copolymers can be prepared by this approach. The organic thio-compound plays a key role in controlling polymerization and the effect of the thio-compound structures is remarkable on the polymerization behavior under γ-ray irradiation. The remarkable advantage of the polymerization is that it can be performed at room temperature or much lower temperature without adding initiator. Macrocyclic polymers have been obtained in the presence of cyclic thio-compound. And moreover the controlled/living free radical polymerizations of azide monomers, which are sensitive to the thermal condition or UV light, have been achieved first time.
Key words: γ-ray irradiation, living/controlled free radical polymerization, thio-compounds

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