UV light and temperature responsive supramolecular ABA triblock copolymers via reversible cyclodextrin complexation

Schmidt, B. V. K. J., Hetzer, M., Ritter, H., & Barner-Kowollik, C. (2013) UV light and temperature responsive supramolecular ABA triblock copolymers via reversible cyclodextrin complexation. Macromolecules, 46(3).

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Abstract

A novel triblock macromolecular architecture based on cyclodextrin (CD) complexation is presented. A CD-functionalized biocompatible poly(N-(2-hydroxypropyl)methacrylamide) (PHPMA) building block (3800 ≤ M n ≤ 10 600 g mol-1; 1.29 ≤ Crossed D sign M ≤ 1.46) and doubly guest-containing poly(N,N-dimethylacrylamide) (PDMAAm) (6400 ≤ Mn ≤ 15 700 g mol-1; 1.06 ≤ Crossed D signM ≤ 1.15) and poly(N,N-diethylacrylamide) (PDEAAm) (5400 ≤ Mn ≤ 12 100 g mol-1; 1.11 ≤ Crossed D signM ≤ 1.33) segments were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently utilized for the formation of a well-defined supramolecular ABA triblock copolymer. The block formation was evidenced via dynamic light scattering (DLS), nuclear Overhauser effect spectroscopy (NOESY), and turbidity measurements. Furthermore, the connection of the blocks was proven to be temperature responsive and - in the case of azobenzene guests - responsive to the irradiation with UV light. The application of these stimuli leads to the disassembly of the triblock copolymer, which was shown to be reversible. In the case of PDEAAm containing triblock copolymers, the temperature-induced aggregation was investigated as well. © 2013 American Chemical Society.

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ID Code: 99365
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :35
Export Date: 5 September 2016
CODEN: MAMOB
Correspondence Address: Ritter, H.; Lehrstuhl für Präparative Polymerchemie, Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine Universität, Universitätsstrasse 1, Geb. 26.33.00, 40225 Düsseldorf, Germany; email: h.ritter@uni-duesseldorf.de
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Keywords: ABA triblock copolymer, Building blockes, Macromolecular architecture, Nuclear overhauser effect spectroscopy, Poly(N , N-diethylacrylamide), Poly(N ,N-dimethylacrylamide), Poly(N-(2-hydroxypropyl)methacrylamide), Reversible addition-fragmentation chain transfer polymerization, Temperature-induced, Temperature-responsive, Triblocks, Turbidity measurements, Acrylic monomers, Dynamic light scattering, Supramolecular chemistry, Turbidity, Block copolymers
DOI: 10.1021/ma302386w
ISSN: 00249297
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: 22 Sep 2016 04:50
Last Modified: 29 Sep 2016 04:37

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