Expanding the stoichiometric window for metal cross-linked gel assembly using competition
Name
21369.full.pdf
Description
Published version
Size
1.13 MB
Format
Adobe PDF
Checksum (MD5)
93372d9c80351f1463d976d48c0f0895
Author(s)
Cazzell, Seth Allen
Holten-Andersen, Niels
Date Issued
October 7, 2019
Journal
Proceedings of the National Academy of Sciences of the United States of America
Publisher
Proceedings of the National Academy of Sciences
Citation
Cazzell, Seth Allen and Niels Holten-Anderse. "Expanding the stoichiometric window for metal cross-linked gel assembly using competition." Proceedings of the National Academy of Sciences of the United States of America 116 (2019): 21369-21374 © 2019 The Author(s)
Version
Final published version
Abstract
Polymer networks with dynamic cross-links have generated widespread interest as tunable and responsive viscoelastic materials. However, narrow stoichiometric limits in cross-link compositions are typically imposed in the assembly of these materials to prevent excess free cross-linker from dissolving the resulting polymer networks. Here we demonstrate how the presence of molecular competition allows for vast expansion of the previously limited range of cross-linker concentrations that result in robust network assembly. Specifically, we use metal-coordinate cross-linked gels to verify that stoichiometric excessive metal ion cross-linker concentrations can still result in robust gelation when in the presence of free ion competing ligands, and we offer a theoretical framework to describe the coupled dynamic equilibria that result in this effect. We believe the insights presented here can be generally applied to advance engineering of the broadening class of polymer materials with dynamic cross-links.
Subjects
Multidisciplinary
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1073/pnas.1906349116
