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Self-Assembly of PEO-b-PCL-b-PMOXA Binary Mixtures

Konishcheva, Evgeniia V. and Zhumaev, Ulmas E. and Meier, Wolfgang P.. (2018) Self-Assembly of PEO-b-PCL-b-PMOXA Binary Mixtures. Macromolecules, 51 (22). pp. 9097-9109.

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Official URL: https://edoc.unibas.ch/72449/

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Abstract

We report about aqueous self-assembly of binary mixtures of poly(ethylene oxide)-block-polycaprolactone-block-poly(2-methyl-2-oxazoline) (PEO-b-PCL-b-PMOXA) triblock copolymers containing identical PEO (45 units) and different PCL (48âEuro"153 units) and PMOXA (3âEuro"25 units) block lengths. All mixtures targeted a certain triblock copolymer; that is, mixtures had the same average block lengths as the targeted polymer. Self-assembled morphologies formed by mixtures were compared with the morphologies formed by the corresponding targeted polymers, which were polymersomes or cloudlike aggregates. The mixtures were prepared using premixing and postmixing protocols. In the premixing protocol, polymers were mixed before self-assembly. In the postmixing protocol, structures were mixed after self-assembly. Self-assembly was performed at 62 °C using the film rehydration method, and the microscale structures were visualized using laser scanning microscopy. In postmixing protocol, polymersomes stayed intact, whereas cloudlike aggregates/partially dissolved polymer/irregularly shaped particles mixed with each other. When polymersomes were mixed with cloudlike aggregates coexisting with polymersomes, we observed formation of multicompartment polymersomes through uptake of one kind of polymersomes by another. In premixing protocol, most of the mixtures resulted in a structure formed by a single targeted polymer. A few exceptions were self-assembly of polymersomes instead of cloudlike aggregates, and vice versa, and formation of multilamellar polymersomes and onionlike structures.
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
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Nov 2019 16:00
Deposited On:06 Nov 2019 16:00

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