RAFT polymerization of N-isopropylacrylamide and acrylic acid under gamma-irradiation in aqueous media

Millard, Pierre-Eric, Barner, Leonie, Stenzel, Martina H., Davis, Thomas P., Barner-Kowollik, Christopher, & Muller, Axel H.E. (2006) RAFT polymerization of N-isopropylacrylamide and acrylic acid under gamma-irradiation in aqueous media. Macromolecular Rapid Communications, 27(11), pp. 821-828.

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The ambient temperature (20 oC) reversible addition fragmentation chain transfer (RAFT) polymerization of N-isopropylacrylamide (NIPAAm) and acrylic acid (AA) conducted directly in aqueous media under gamma-initiation (at dose rate of 30 Gy h-1) proceeds in a controlled (typically Mw/Mn < 1.2) to near quantitative conversions and up to number-average molecular weights of 2.5 x 105 g . mol-1for PNIPAAm and 1.1 x 105 g . mol-1 for PAA via two water-soluble trithiocarbonate chain transfer agents, i.e., S,S-bis(α,α′-dimethyl-α″-acetic acid)trithiocarbonate (TRITT) and 3-benzylsulfanylthiocarbonylsulfanyl propionic acid (BPATT). The generated polymers are successfully chain extended, which suggests that the RAFT agents are stable throughout the polymerization process so that complex and well-defined architectures can be obtained.

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ID Code: 97500
Item Type: Journal Article
Refereed: Yes
Keywords: acrylic acid; N-isopropylacrylamide; kinetics (polym.); gamma-radiation; reversible addition fragmentation chain transfer (RAFT); smart polymers
DOI: 10.1002/marc.200600115
ISSN: 1022-1336
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 29 Jul 2016 01:11
Last Modified: 02 Aug 2016 04:21

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