Electrospray ionization mass spectrometry investigation of reversible addition fragmentation chain transfer mediated acrylate polymerizations initiated via60Co γ-Irradiation: Mapping reaction pathways

Tara M. Lovestead, Gene Hart-Smith, Thomas P. Davis, Martina H. Stenzel, Christopher Barner-Kowollik

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42 Citations (Scopus)

Abstract

Reversible addition fragmentation chain transfer (RAFT) mediated methyl acrylate and butyl acrylate polymerizations initiated via 60Co γ-irradiation were investigated using electrospray ionization mass spectrometry (ESI-MS). The polymer end-groupings were mapped using both a hybrid quadrupole-time-of-flight instrument and a quadrupole ion trap mass spectrometer. Three potential initiation processes were identified during the cumyl phenyl dithioacetate (CPDA) mediated acrylate polymerizations. CPDA dissociates into a cumyl radical and a phenyl dithioester radical (Z-group). A set of polymer product ions indicates that a small, yet significant, fraction of the γ-generated phenyl dithioacetate radical contributes to the initiation process. Furthermore, the phenyl dithioacetate group undergoes cleavage to yield thiol end groups that react to form disulfide linkages. Additionally, polymer product ions indicative of a small amount of water radiolysis were observed, and evidence that the butyl acrylate monomer interacts with γ-radiation to yield an initiating species is gained.

Original languageEnglish
Pages (from-to)4142-4153
Number of pages12
JournalMacromolecules
Volume40
Issue number12
DOIs
Publication statusPublished - 12 Jun 2007
Externally publishedYes

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