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Giant polymersomes from non-assisted film hydration of phosphate-based block copolymers

Abstract

The self-assembly of amphiphilic block copolymers is a fast way to prepare chemically versatile and stable “protocells” that can act as reactor or confinement. However, controlling their self-assembly into giant unilamellar vesicles (GUVs) with diameters of several micrometers is challenging. Electroformation had been used to generate GUVs from amphiphilic block copolymers which can be studied by light microscopy and resemble cell-like entities. However, a mild film hydration protocol for GUV preparation would be desirable in order to prepare libraries of protocells for further applications. Here, we present the self-assembly of novel amphiphilic polybutadiene-block-polyphosphoester block copolymers into GUVs by simple film hydration. These amphiphiles are synthetic analogs to phospholipids and carry the hydrophilic poly(ethylene ethyl phosphate) (PEEP) block. The GUVs (with diameters of ca. 10-40 µm) were formed in high yield by simple non-assisted film hydration requiring no external forces and no need of commonly applied electroformation. PEEP-based block copolymers with a lamellar bulk morphology produced GUVs in high yield and outperformed commonly used block copolymers (e.g. with poly(ethylene oxide) as a hydrophilic segment). We quantified their respective yield (number of GUVs formed), diameters and monitored their stability over time. In addition, we proved their encapsulation capacity and permeability to hydrophobic and hydrophilic fluorescent cargo. Due to their high performance, these phosphate-based amphiphilic block copolymers are promising candidates towards the generation of protocells and self-assembled microreactors.

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Publication details

The article was received on 03 Jul 2018, accepted on 09 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8PY00992A
Citation: Polym. Chem., 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Giant polymersomes from non-assisted film hydration of phosphate-based block copolymers

    E. Rideau, F. R. Wurm and K. Landfester, Polym. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8PY00992A

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