Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/161136
Title: Sol–gel transitions of comb-like polymethacrylate copolymers by mechano-thermal stimuli in water
Authors: Jonnalagadda, Umesh Sai
Nguyen, Tuan Minh
Li, Feifei
Lee, Jim H. C.
Liu, Xu
Goto, Atsushi
Kwan, James J.
Keywords: Engineering::Chemical engineering
Issue Date: 2020
Source: Jonnalagadda, U. S., Nguyen, T. M., Li, F., Lee, J. H. C., Liu, X., Goto, A. & Kwan, J. J. (2020). Sol–gel transitions of comb-like polymethacrylate copolymers by mechano-thermal stimuli in water. Macromolecular Chemistry and Physics, 221(13), 2000088-. https://dx.doi.org/10.1002/macp.202000088
Project: A1786a0029
M4081814
NMRC/OFYIRG/0034/2017 
Journal: Macromolecular Chemistry and Physics
Abstract: Sonogelation by supramolecular gelators is highlighted as a paradigm shift for their potential applications in material and biomedical sciences. Yet, these materials require organic solvents and low-frequency ultrasound, limiting their utility. Here, a comb-like polymethacrylate copolymer is synthesized with 2,6-bis(1-methylbenzimidazolyl)-4-oxypyridine tridentate ligand randomly distributed on poly(ethylene glycol) side chains. Upon addition of zinc perchlorate salt, this copolymer rapidly forms a hydrogel after exposure to either mechanical (i.e., ultrasound) or thermal stimuli. Spectroscopic analysis, to elucidate the mechanism, indicates metal ion coordination to ligand as well as the carbonyl and ethylene glycol units; interestingly, 1H-NMR suggests that the coordination between tridentate ligand moiety and Zn2+ is unexpectedly weaker in water than in acetonitrile. Investigations by dynamic light scattering indicates that the copolymer forms nanodispersions in excess salt, which coalesces to form a hydrogel by either heating or high intensity focused ultrasound (HIFU). Rheological quantification of these gels suggests stronger crosslinking by HIFU compared to heating.
URI: https://hdl.handle.net/10356/161136
ISSN: 1022-1352
DOI: 10.1002/macp.202000088
Schools: School of Chemical and Biomedical Engineering 
School of Physical and Mathematical Sciences 
Organisations: Institute of Chemical and Engineering Sciences, A*STAR
Rights: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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