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http://hdl.handle.net/1942/13095
Title: | Revealing Model Dependencies in "Assessing the RAFT Equilibrium Constant via Model Systems: An EPR Study" | Authors: | JUNKERS, Tanja Barner-Kowollik, Christopher Coote, Michelle L. |
Issue Date: | 2011 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | MACROMOLECULAR RAPID COMMUNICATIONS, 32(23), p. 1891-1898 | Abstract: | In a recent article (W. Meiser, M. Buback, Assessing the RAFT Equilibrium Constant via Model Systems: An EPR Study, Macromol. Rapid Commun. 2011, 18, 1490-1494), it is claimed that evidence is found that unequivocally proves that quantum mechanical calculations assessing the equilibrium constant and fragmentation rate coefficients in dithiobenzoate-mediated reversible addition fragmentation transfer (RAFT) systems are beset with a considerable uncertainty. In the present work, we show that these claims made by Meiser and Buback are beset with a model dependency, as a critical key parameter in their data analysis the addition rate coefficient of the radicals attacking the C=S double bond in the dithiobenzoate induces a model insensitivity into the data analysis. Contrary to the claims made by Meiser and Buback, their experimental results can be brought into agreement with the quantum chemical calculations if a lower addition rate coefficient of cyanoisopropyl radicals (CIP) to the CIP dithiobenzoate (CPDB) is assumed. To resolve the model dependency, the addition rate coefficient of CIP radicals to CPDB needs to be determined as a matter of priority. | Notes: | [Junkers, Thomas] Univ Hasselt, Inst Mat Res IMO, Polymer React Design Grp, B-3590 Diepenbeek, Belgium. [Barner-Kowollik, Christopher] KIT, Inst Tech Chem & Polymerchem, D-76128 Karlsruhe, Germany. [Coote, Michelle L.] Australian Natl Univ, Res Sch Chem, ARC Ctr Excellence Free Rad Chem & Biotechnol, Canberra, ACT 0200, Australia. | Keywords: | ab initio quantum mechanical calculations;intermediate radical termination;kinetics (polymer);model dependency;rate coefficients;reversible addition fragmentation transfer (RAFT) | Document URI: | http://hdl.handle.net/1942/13095 | ISSN: | 1022-1336 | e-ISSN: | 1521-3927 | DOI: | 10.1002/marc.201100494 | ISI #: | 000298098100003 | Rights: | 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2013 |
Appears in Collections: | Research publications |
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