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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/13852

Title: Thermally responsive core-shell microparticles and cross-linked networks based on nitrone chemistry
Authors: Barner, Leonie
Quick, Alexander S.
Vogt, Andrew P.
Winkler, Volker
Barner-Kowollik, Christopher
Issue Date: 2012
Citation: POLYMER CHEMISTRY, 3 (8), p. 2266-2276
Abstract: Complex cross-linked soluble architectures with molecular weights ranging from 25 000 to 71 000 g mol(-1) and polydispersities (PDIs) ranging from 2.5 to 8.1 are generated using nitrone mediated chemistry. These cross-linked architectures are subsequently cleaved into their constituting fragments, i.e. linear chains with molecular weights ranging from 36 000 to 40 000 g mol(-1) and a PDI of 2.0 or network fragments with molecular weights ranging from 28 000 to 30 000 g mol(-1) and PDIs from 2.5 to 3.7, respectively. The cleavage into linear chains or network fragments depends on the pathway of network formation. Nitrone mediated reactions are also applied for the synthesis of microspheres. Conventional distillation precipitation polymerization was performed in the presence of a nitrone, leading to uniform microspheres with diameters ranging from 2.2 to 2.4 mu m. These microspheres feature alkoxyamine functionalities throughout their interior and on their surface. The alkoxyamine functionality on the surface is employed in a subsequent nitroxide mediated polymerization (NMP) with N-isopropylacrylamide (NiPAAm) in a 'grafting from' approach to generate pNiPAAm on the surface of the microspheres. The resulting stimuli-responsive core-shell microspheres are characterized via SEM, XPS, elemental analysis as well as turbidity measurements. The characterization methods confirm the presence of a stimuli-responsive layer of pNiPAAm on the microspheres' surface.
Notes: [Junkers, Thomas] Univ Hasselt, Polymer React Design Grp, Inst Mat Res, BE-3590 Diepenbeek, Belgium. [Winkler, Volker] Karlsruhe Inst Technol KIT, Inst Appl Mat IAM WPT, D-76344 Eggenstein Leopoldshafen, Germany. [Quick, Alexander S.; Vogt, Andrew P.; Winkler, Volker; Barner-Kowollik, Christopher] Karlsruhe Inst Technol KIT, Inst Tech Chem & Polymerchem, D-76128 Karlsruhe, Germany. [Barner, Leonie; Barner-Kowollik, Christopher] Karlsruhe Inst Technol KIT, Inst Funkt Grenzflachen, D-76344 Eggenstein Leopoldshafen, Germany. [Barner, Leonie; Barner-Kowollik, Christopher] Karlsruhe Inst Technol KIT, Soft Matter Synth Lab, Inst Biol Grenzflachen 1, D-76344 Eggenstein Leopoldshafen, Germany. thomas.junkers@uhasselt.be; christopher.barner-kowollik@kit.edu
URI: http://hdl.handle.net/1942/13852
DOI: 10.1039/c2py20272g
ISI #: 000305964400043
ISSN: 1759-9954
Category: A1
Type: Journal Contribution
Validation: ecoom, 2013
Appears in Collections: Research publications

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