Loading...
Switchable reversible addition-fragmentation chain transfer (RAFT) polymerization in aqueous solution, N, N-dimethylacrylamide
Keddie, Daniel J. Guerrero-Sanchez, Carlos Moad, Graeme Rizzado, Ezio Thang, San H.
Keddie, Daniel J.
Guerrero-Sanchez, Carlos
Moad, Graeme
Rizzado, Ezio
Thang, San H.
Editors
Other contributors
Affiliation
Epub Date
Issue Date
2011-08-15
Submitted date
Files
Alternative
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 (pK a) 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 (pK a ∼ 3.13). The preparation of unimodal low dispersity block copolymers of PDMAm 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.
Citation
Keddie, D.J., Guerrero-Sanchez, C., Moad, G., Rizzardo, E. and Thang, S.H. (2011) Switchable reversible addition-fragmentation chain transfer (RAFT) polymerization in aqueous solution, N, N-dimethylacrylamide. Macromolecules, 44, 17, pp. 6738–6745.
Publisher
Journal
Research Unit
PubMed ID
PubMed Central ID
Embedded videos
Additional Links
Type
Journal article
Language
en
Description
This is an accepted manuscript of an article published by American Chemistry Society in Macromolecules on 15/08/2011, available online: https://doi.org/10.1021/ma200760q ©American Chemical Society. The accepted version of the publication may differ from the final published version.
Series/Report no.
ISSN
0024-9297
EISSN
1520-5835
ISBN
ISMN
Gov't Doc #
Sponsors
The authors acknowledge the Capability Development Fund of CSIRO Materials Science and Engineering for financial support. D.J.K. acknowledges the Office of the Chief Executive of CSIRO for an OCE postdoctoral fellowship.