Tannic acid-mediated aggregate stabilization of poly(N-vinylpyrrolidone)-b-poly(oligo (ethylene glycol) methyl ether methacrylate) double hydrophilic block copolymers

Al Nakeeb, N., Nischang, I. and Schmidt, B. V.K.J. (2019) Tannic acid-mediated aggregate stabilization of poly(N-vinylpyrrolidone)-b-poly(oligo (ethylene glycol) methyl ether methacrylate) double hydrophilic block copolymers. Nanomaterials, 9(5), 662. (doi:10.3390/nano9050662) (PMID:31035517) (PMCID:PMC6566864)

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Abstract

The self-assembly of block copolymers in aqueous solution is an important field in modern polymer science that has been extended to double hydrophilic block copolymers (DHBC) in recent years. In here, a significant improvement of the self-assembly process of DHBC in aqueous solution by utilizing a linear-brush macromolecular architecture is presented. The improved self-assembly behavior of poly(N-vinylpyrrolidone)-b-poly(oligo(ethylene glycol) methyl ether methacrylate) (PVP-b-P(OEGMA)) and its concentration dependency is investigated via dynamic light scattering (DLS) (apparent hydrodynamic radii ≈ 100–120 nm). Moreover, the DHBC assemblies can be non-covalently crosslinked with tannic acid via hydrogen bonding, which leads to the formation of small aggregates as well (apparent hydrodynamic radius ≈ 15 nm). Non-covalent crosslinking improves the self-assembly and stabilizes the aggregates upon dilution, reducing the concentration dependency of aggregate self-assembly. Additionally, the non-covalent aggregates can be disassembled in basic media. The presence of aggregates was studied via cryogenic scanning electron microscopy (cryo-SEM) and DLS before and after non-covalent crosslinking. Furthermore, analytical ultracentrifugation of the formed aggregate structures was performed, clearly showing the existence of polymer assemblies, particularly after non-covalent crosslinking. In summary, we report on the completely hydrophilic self-assembled structures in solution formed from fully biocompatible building entities in water.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Schmidt, Dr Bernhard
Authors: Al Nakeeb, N., Nischang, I., and Schmidt, B. V.K.J.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Nanomaterials
Publisher:MDPI
ISSN:2079-4991
ISSN (Online):2079-4991
Published Online:26 April 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Nanomaterials 9(5): 662
Publisher Policy:Reproduced under a Creative Commons License

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