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Complex Self-Assembly Behavior of Bis-hydrophilic PEO-b-PCL-b-PMOXA Triblock Copolymers in Aqueous Solution

Konishcheva, Evgeniia V. and Zhumaev, Ulmas E. and Kratt, Maximilian and Oehri, Valentin and Meier, Wolfgang. (2017) Complex Self-Assembly Behavior of Bis-hydrophilic PEO-b-PCL-b-PMOXA Triblock Copolymers in Aqueous Solution. Macromolecules, 50 (18). pp. 7155-7168.

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Official URL: http://edoc.unibas.ch/57060/

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Abstract

We report aqueous self-assembly of linear amphiphilic triblock copolymers poly(ethylene oxide)-block-polycaprolactone-block-poly(2-methyl-2-oxazoline) (PEO-b-PCL-b-PMOXA) and their PEO-b-PCL precursors with different PCL and PMOXA block lengths using three preparation methods: film rehydration, solvent evaporation, and cosolvent. For PEO-b-PCL, the self-assembled structures were ordinary spherical particles and polymersomes. For PEO-b-PCL-b-PMOXA, we observed polymersomes with asymmetric membrane, cloud-like aggregates, elongated particles, Y-shaped elongated particles, and 3D networks. All structures were of micrometer size and characterized using laser scanning microscopy (LSM). 3D networks were also characterized using z-stack confocal LSM, transmission electron microscopy (TEM), and cryogenic TEM. We demonstrated that film rehydration method results in pseudoequilibrium structures, whereas structures formed using solvent evaporation and cosolvent methods are under kinetic control. We showed how kinetically controlled structures can be transformed into pseudoequilibrium morphologies.
Faculties and Departments:05 Faculty of Science > Departement Chemie
05 Faculty of Science > Departement Chemie > Chemie > Makromolekulare Chemie (Meier)
UniBasel Contributors:Meier, Wolfgang P.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:0024-9297
e-ISSN:1520-5835
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Nov 2017 11:59
Deposited On:13 Nov 2017 11:59

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