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https://hdl.handle.net/1959.11/13057
Title: | Switchable Reversible Addition-Fragmentation Chain Transfer (RAFT) Polymerization in Aqueous Solution, N,N-Dimethylacrylamide | Contributor(s): | Keddie, Daniel (author); Guerrero-Sanchez, Carlos (author); Moad, Graeme (author); Rizzardo, Ezio (author); Thang, San H (author) | Publication Date: | 2011 | DOI: | 10.1021/ma200760q | Handle Link: | https://hdl.handle.net/1959.11/13057 | Abstract: | Reversible addition-fragmentation chain transfer (RAFT) polymerization of a 'more activated monomer' (MAM), N,N-dimethylacrylamide (DMAm), has been successfully achieved in aqueous solution using an acid/base switchable pyridyl-substituted dithiocarbamate RAFT agent. The effect of strength (pKa) and stoichiometry of the acid used to switch the RAFT agent on the molecular weight and dispersity of poly(N,N-dimethylacrylamide) (PDMAm) were examined, making use of high-throughput protocol. Best control was achieved with a stoichiometric amount of the strongest acid investigated, p-toluenesulfonic acid monohydrate. Use of weaker acids (higher pKa) or less than stoichiometric amounts of acid with respect to RAFT agent resulted in broader molecular weight distributions. These results can be rationalized in terms of the extent of protonation of the pyridine nitrogen of the RAFT agent (pKa~3.13). The preparation of unimodal low dispersity block copolymers of PDMA with the 'less-activated' monomers (LAMs) N-vinylcarbazole (NVC), vinyl acetate (VAc), and N-vinylpyrrolidone (NVP) demonstrated the fidelity of the RAFT end group in these experiments and provides a further example of the utility of switchable RAFT polymerization. | Publication Type: | Journal Article | Source of Publication: | Macromolecules, 44(17), p. 6738-6745 | Publisher: | American Chemical Society | Place of Publication: | United States of America | ISSN: | 1520-5835 0024-9297 |
Fields of Research (FoR) 2008: | 030306 Synthesis of Materials 030305 Polymerisation Mechanisms |
Socio-Economic Objective (SEO) 2008: | 970103 Expanding Knowledge in the Chemical Sciences | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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