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Polymers 2013, 5(3), 1081-1101; doi:10.3390/polym5031081
Article

Synthesis and Solution Properties of Double Hydrophilic Poly(ethylene oxide)-block-poly(2-ethyl-2-oxazoline) (PEO-b-PEtOx) Star Block Copolymers

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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)
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Abstract

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.
Keywords: poly(2-ethyl-2-oxazoline); star-shaped block copolymers; double hydrophilic block copolymers poly(2-ethyl-2-oxazoline); star-shaped block copolymers; double hydrophilic block copolymers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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