Synthesis and Solution Properties of Double Hydrophilic Poly(ethylene oxide)-block-poly(2-ethyl-2-oxazoline) (PEO-b-PEtOx) Star Block Copolymers
by
Tobias Rudolph 1,2, Sarah Crotty 1,2,3, Moritz Von der Lühe 1,2, David Pretzel 1,2, Ulrich S. Schubert 1,2,3 and Felix H. Schacher 1,2,*
Tobias Rudolph 1,2, Sarah Crotty 1,2,3, Moritz Von der Lühe 1,2, David Pretzel 1,2, Ulrich S. Schubert 1,2,3 and Felix H. Schacher 1,2,*
1
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, Jena 07743, Germany
2
Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, Jena 07743, Germany
3
Dutch Polymer Institute, P.O. Box 902, Eindhoven 5600 AX, The Netherlands
*
Author to whom correspondence should be addressed.
Polymers 2013, 5(3), 1081-1101; https://doi.org/10.3390/polym5031081
Received: 28 June 2013 / Revised: 27 July 2013 / Accepted: 19 August 2013 / Published: 2 September 2013
(This article belongs to the Special Issue Non-Equilibrium Blockcopolymer Self-Assembly)
We demonstrate the synthesis of star-shaped poly(ethylene oxide)-block-poly(2-ethyl-2-oxazoline) [PEOm-b-PEtOxn]x block copolymers with eight arms using two different approaches, either the “arm-first” or the “core-first” strategy. Different lengths of the outer PEtOx blocks ranging from 16 to 75 repeating units were used, and the obtained materials [PEO28-b-PEtOxx]8 were characterized via size exclusion chromatography (SEC), nuclear magnetic resonance spectroscopy (NMR), and Fourier-transform infrared spectroscopy (FT-IR) measurements. First investigations regarding the solution behavior in water as a non-selective solvent revealed significant differences. Whereas materials synthesized via the “core-first” method seemed to be well soluble (unimers), aggregation occurred in the case of materials synthesized by the “arm-first” method using copper-catalyzed azide-alkyne click chemistry.
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Keywords:
poly(2-ethyl-2-oxazoline); star-shaped block copolymers; double hydrophilic block copolymers
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MDPI and ACS Style
Rudolph, T.; Crotty, S.; Von der Lühe, M.; Pretzel, D.; Schubert, U.S.; Schacher, F.H. Synthesis and Solution Properties of Double Hydrophilic Poly(ethylene oxide)-block-poly(2-ethyl-2-oxazoline) (PEO-b-PEtOx) Star Block Copolymers. Polymers 2013, 5, 1081-1101.
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