Dual thermo- and photo-responsive micelles based on miktoarm star polymers

Blasco, E., Schmidt, B. V. K. J., Barner-Kowollik, C., Piñol, M., & Oriol, L. (2013) Dual thermo- and photo-responsive micelles based on miktoarm star polymers. Polymer Chemistry, 4(16).

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Abstract

We report the synthesis and characterization of three novel azobenzene-containing miktoarm star polymers AB3 (Mn = 14 800, DM = 1.22, Mn = 17 400, DM = 1.10 and Mn = 26 200, DM = 1.12) as well as their self-assembly properties in water. The three polymers are composed of an azopolymer and three identical arms of poly(N,N-diethylacrylamide) (PDEAA), featuring thermo-responsive properties. By carefully selecting the polymerization degree of PDEAA, and consequently the hydrophobic/hydrophilic ratio, a specific miktoarm polymer has been identified that forms stable micelles in water as is clearly revealed by Transmission Electron Microscopy (TEM). In addition, the thermo- and photo-responsive properties of the polymeric micelles in water were investigated. Encapsulation of Nile Red was probed via fluorescence spectroscopy as well as its release from the loaded probes triggered by UV irradiation, which causes a trans-to-cis isomerisation of the azobenzene moieties. © 2013 The Royal Society of Chemistry.

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ID Code: 99341
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :21
Export Date: 5 September 2016
Correspondence Address: Barner-Kowollik, C.; Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany; email: barner-kowollik@kit.edu
Funding Details: DFG, Deutsche Forschungsgemeinschaft
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Keywords: Hydrophobic/hydrophilic, Miktoarm star polymers, Photo-responsive property, Poly(N , N-diethylacrylamide), Polymeric micelle, Polymerization degree, Synthesis and characterizations, Thermo-responsive, Azobenzene, Fluorescence spectroscopy, Micelles, Polymerization, Transmission electron microscopy, Polymers
DOI: 10.1039/c3py00576c
ISSN: 17599954
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 03:42

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