Supramolecular polymer hydrogels induced by host-guest interactions with di-[cyclobis(paraquat-p-phenylene)] cross-linkers: from molecular complexation to viscoelastic properties

Fumagalli, M., Belal, K., Guo, H., Stoffelbach, F., Cooke, G. , Marcellan, A., Woisel, P. and Hourdet, D. (2017) Supramolecular polymer hydrogels induced by host-guest interactions with di-[cyclobis(paraquat-p-phenylene)] cross-linkers: from molecular complexation to viscoelastic properties. Soft Matter, 13(31), pp. 5269-5282. (doi:10.1039/C7SM01051F) (PMID:28676876)

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Abstract

Supramolecular polymer networks have been designed on the basis of a -electron donor/acceptor complex: naphthalene (N)/cyclobis(paraquat-p-phenylene) (CBPQT4+=B). For this purpose, a copolymer of N,N-dimethylacrylamide P(DMA-N1), lightly decorated with 1 mol% of naphthalene pendant groups, has been studied in semi-dilute un-entangled solution in the presence of di-CBPQT4+ (BB) crosslinker type molecules. While calorimetric experiments demonstrate the quantitative binding between N and B groups up to 60 °C, the introduction of BB crosslinkers into the polymer solution gives rise to gel formation above the overlap concentration. From a comprehensive investigation of viscoelastic properties, performed at different concentrations, host/guest stoichiometric ratios and temperatures, the supramolecular hydrogels are shown to follow a Maxwellian behavior with a strong correlation of the plateau modulus and the relaxation time with the effective amount of interchain cross-linkers and their dissociation dynamics, respectively. The calculation of the dissociation rate constant of the supramolecular complex, by extrapolation of the relaxation time of the network back to the beginning of the gel regime, is discussed in the framework of theoretical and experimental works on associating polymers.

Item Type:Articles
Additional Information:The authors thank the ANR (STRAPA project, ANR-12-BS08-0005) for funding.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cooke, Professor Graeme
Authors: Fumagalli, M., Belal, K., Guo, H., Stoffelbach, F., Cooke, G., Marcellan, A., Woisel, P., and Hourdet, D.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Soft Matter
Publisher:Royal Society of Chemistry
ISSN:1744-683X
ISSN (Online):1744-6848
Published Online:26 June 2017
Copyright Holders:Copyright © 2017 Royal Society of Chemistry
First Published:First published in Soft Matter 13(31):5269-5282
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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