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Title: | Thioketone-Mediated Polymerization with Dithiobenzoates: Proof for the Existence of Stable Radical Intermediates in RAFT Polymerization | Authors: | JUNKERS, Tanja Delaittre, Guillaume Chapman, Robert Guenzler, Fabian Chernikova, Elena Barner-Kowollik, Christopher |
Issue Date: | 2012 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | MACROMOLECULAR RAPID COMMUNICATIONS, 33 (11), p. 984-990 | Abstract: | A novel dithioester control agent [dimethyltetrathioterephtalate (DMTTT)] is presented for the thioketone-mediated radical polymerization (TKMP) of n-butyl acrylate. The rate of polymerization is significantly decreased in the presence of DMTTT indicating formation of dormant radical species. During polymerization, molar masses increase linearly with monomer conversion with reasonably narrow initial molar mass distributions (PDI between 1.3 and 1.8), whereas the dispersity increases during the course of the polymerization due to irreversible termination of both propagating and dormant radicals. The present results thus highlight the possibility of a mixed mechanism operating in RAFT polymerization, which combines slow fragmentation (long-lived intermediates) and intermediate radical termination. | Notes: | [Junkers, Thomas; Delaittre, Guillaume; Guenzler, Fabian; Barner-Kowollik, Christopher] Karlsruhe Inst Technol, Inst Tech & Polymerchem, D-76131 Karlsruhe, Germany. [Junkers, Thomas] Univ Hasselt, Inst Mat Res, Polymer React Design Grp, BE-3590 Diepenbeek, Belgium. [Delaittre, Guillaume] Karlsruhe Inst Technol, Inst Zool, D-76131 Karlsruhe, Germany. [Chapman, Robert] Univ New S Wales, Ctr Adv Macromol Design, Sydney, NSW 2052, Australia. [Chernikova, Elena] Moscow MV Lomonosov State Univ, Fac Chem, Polymer Dept, Moscow 119991, Russia. | Keywords: | Polymer Science; controlled/living radical polymerization; dithiobenzoate; radical stability; reversible addition-fragmentation transfer; thioketone;controlled; living radical polymerization; dithiobenzoate; radical stability; reversible addition-fragmentation transfer; thioketone | Document URI: | http://hdl.handle.net/1942/13793 | ISSN: | 1022-1336 | e-ISSN: | 1521-3927 | DOI: | 10.1002/marc.201200128 | ISI #: | 000304831900005 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2013 |
Appears in Collections: | Research publications |
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