Computer-Aided Design of a Destabilized RAFT Adduct Radical: Toward Improved RAFT Agents for Styrene-block-Vinyl Acetate Copolymers

Michelle L. Coote, David J. Henry

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

High-level ab initio molecular orbital calculations indicate that a fluorine Z substituent significantly destabilizes the RAFT adduct radical, R'SO·(Z)SR, relative to known Z substituents. This destabilization of the RAFT adduct radical lowers the fragmentation enthalpy relative to normal dithioesters, but without stabilizing the C=S bond of the product RAFT agent, as in xanthate- or dithiocarbamate-mediated polymerization. On the basis of these calculations, it is predicted that, provided appropriate R groups are chosen, RAFT agents containing fluorine Z substituents (i.e., S=C(F)SR, fluorodithioformates, or "F-RAFT" agents) should provide a basis for improved control of monomers with reactive propagating radicals (such as vinyl acetate) and should have the advantage that their C=S bonds remain reactive enough for control of monomers with more stable propagating radicals (such as styrene) and hence the production of styrene-vinyl acetate copolymers.

Original languageEnglish
Pages (from-to)5774-5779
Number of pages6
JournalMacromolecules
Volume38
Issue number13
DOIs
Publication statusPublished - 1 Jun 2005
Externally publishedYes

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