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)
|
Text
143105.pdf - Accepted Version 1MB |
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 |
University Staff: Request a correction | Enlighten Editors: Update this record
Altmetric
Altmetric