60Co ¦Ã-Irradiation-Initiated ¡°Living¡± Free-Radical Polymerization in the Presence of Thio-compounds

  • The free-radical polymerization of vinyl monomers in the presence of dibenzyl trithiocarbonate (DBTTC) and under 60Co ¦Ã-irradiation is of living character. Under 60Co irradiation, the bonds between benzyl group and sulfur were cleaved, benzyl radicals initiate the polymerization. The propagating radical together with trithiocarbonate radicals form a dormant polymer chain. The fast equilibrium between propagation radical and dormant polymer chain controls the polymerization.

          Macromolecular Rapid Communications 22 (2011) 5 315-319

  • As an effective initiation method of polymerization, ¦Ã-ray irradiation usually leads to uncontrolled molecular weight polymers, even crosslink. Recently 60Co ¦Ã-ray irradiation controlled/living free radical polymerization was achieved in the presence of some thiocarbonylthio compounds in our lab. To further understand the basic principle, in this dissertation, the influence of the structure of thio compounds on polymerization behavior under ¦Ã-ray irradiation was systematically investigated.

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