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Thermo‐Responsive Nanogels Based on Poly[NIPAAm‐graft‐(2‐alkyl‐2‐oxazoline)]s Crosslinked in the Micellar State |
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| Authors: | Stefan Zschoche Juan Rueda Volodymyr Boyko Franziska Krahl Karl‐Friedrich Arndt Brigitte Voit |
| Affiliation: | 1. Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, D‐01069 Dresden, Germany;2. Laboratório de Polímeros, Sección Física, DAI, Pontificia Universidad Católica del Perú, Box, 1761 Lima, Perú;3. Polymer Physics, BASF AG, 67056 Ludwigshafen, Germany;4. Physical Chemistry of Polymers, Dresden University of Technology, 01062 Dresden, Germany |
| Abstract: | Graft copolymers with thermo‐sensitive PNIPAAm backbone and hydrophilic PEtOxa graft chains demonstrated typical amphiphilic behavior. For specific compositions stable micelle‐like aggregates were formed depending on the temperature. Applying long polyoxazoline side chains ( > 120), stable reversible micelle‐like aggregates with hydrodynamic radii of 30–40 nm could be obtained between 33 and 55 °C. These graft copolymers have been successfully crosslinked by electron‐beam irradiation in the micellar state yielding core/shell type nanogels with thermo‐reversible swelling behavior. The temperature dependent volume change of the new thermo‐responsive nanogels due to the phase transition of the PNIPAAm core has been verified by DLS.  |
| Keywords: | crosslinking electron beam irradiation graft copolymers self‐organization stimuli‐sensitive polymers |