Thermal Polymerization of Styrene in the Presence of Stable Radicals and Inhibitors.

摘要

Thermal polymerization of styrene in the presence of several radical scavengers and inhibitors was investigated. Rates, molecular weights and polydispersities depend on the nature of the scavenger, on its concentration and reaction temperature. In the best controlled systems, molecular weights up to M sub n approx. 10,000 and polydispersities M sub w/M sub n approx. 1.2 were observed. It is proposed that in addition to the reversible activation by the homolytic cleavage of the 'dormant' (P-R) species, degenerative chain transfer reactions may be involved.