Visible-Light-Induced Chain Reshuffling of Poly(methyl acrylates) with Thiocarbonylthio End Groups
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초록
내용
In this study, we observed that in the photoiniferter polymerization of methyl acrylate, continuous light irradiation after the monomer is nearly exhausted (>95%) reduces the proportion of living chains and rapidly increases the proportion of dead chains. GPC, TG-HPLC, and 1H-NMR experiments confirmed two key findings: ⅰ) The amount of dead chains increases linearly with time, reaching about 17% of the total polymer after 168 hours, ⅱ) The formed dead chains result from recombination or disproportionation between transient propagating radicals. This outcome would not occur if the TCT radicals were chemically stable and persistent.